---
product_id: 565419617
title: "FENDER Patented Callus Builder & Finger Strengthener – Resistance Finger Exerciser for Guitar, Bass & Violin – Guitar Finger Trainer & Grip Strength Tool – Ideal Guitar & Bass Accessories (Tensions: RED=8-Lbs; BLACK=15-Lbs)"
brand: "fender"
price: "380 kr"
currency: DKK
in_stock: true
reviews_count: 8
category: "Fender"
url: https://www.desertcart.dk/products/565419617-fender-patented-callus-builder-and-finger-strengthener-resistance-finger-exerciser
store_origin: DK
region: Denmark
---

# Patented Stratocaster shape Up to 15-lb resistance Ergonomic finger positioning FENDER Patented Callus Builder & Finger Strengthener – Resistance Finger Exerciser for Guitar, Bass & Violin – Guitar Finger Trainer & Grip Strength Tool – Ideal Guitar & Bass Accessories (Tensions: RED=8-Lbs; BLACK=15-Lbs)

**Brand:** fender
**Price:** 380 kr
**Availability:** ✅ In Stock

## Summary

> 🎶 Strengthen your strings, own the stage!

## Quick Answers

- **What is this?** FENDER Patented Callus Builder & Finger Strengthener – Resistance Finger Exerciser for Guitar, Bass & Violin – Guitar Finger Trainer & Grip Strength Tool – Ideal Guitar & Bass Accessories (Tensions: RED=8-Lbs; BLACK=15-Lbs) by fender
- **How much does it cost?** 380 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.dk](https://www.desertcart.dk/products/565419617-fender-patented-callus-builder-and-finger-strengthener-resistance-finger-exerciser)

## Best For

- fender enthusiasts

## Why This Product

- Trusted fender brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Compact & Gift-Ready:** Lightweight, portable, and perfect for musicians on the go or as a thoughtful gift.
- • **Iconic Fender Design:** Officially licensed Stratocaster shape for authentic feel and style.
- • **Dual Resistance Levels:** Choose 8-lb (Red) or intense 15-lb (Black) for tailored finger strength.
- • **Ergonomic Play Position:** Mirrors natural hand angles for targeted finger endurance and coordination.
- • **Realistic String Simulation:** Raised ridges mimic string tension to build true guitar calluses.

## Overview

The Fender Patented Callus Builder & Finger Strengthener is a uniquely designed finger exerciser shaped like the iconic Stratocaster guitar. It features raised ridges that simulate real string tension, available in two resistance levels (8-lb and 15-lb), and ergonomically mirrors playing hand positions to build finger strength, coordination, and calluses efficiently. Lightweight and compact, it’s a must-have accessory for guitar, bass, and violin players seeking to enhance their performance and endurance.

## Description

Buy FENDER Patented Callus Builder & Finger Strengthener – 15-lb Resistance Finger Exerciser for Guitar, Bass & Violin – Guitar Finger Trainer & Grip Strength Tool – Ideal Guitar & Bass Accessories: Guitar & Bass Accessories - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Works as advertised! - It has a magnetic on the back, it's also a potato chip bag clip ( too funny but true) It has strong resistance and starts to build calluses on fingers after just a few days!
Review: Great product and purchase 👌 - Easy to use! Already feeling the finger tips getting the work out! After two days Great product 👌

## Features

- ESSENTIAL GUITAR & BASS ACCESSORY – From beginners to pros, this must-have guitar finger trainer improves strength, coordination, and endurance—perfect for daily guitar training or warm-ups before a performance.
- LICENSED and PATENTED FENDER CALLUS BUILDER – Designed in the shape of Fender’s iconic Stratocaster, this officially licensed guitar callus builder is a standout in any collection of guitar & bass accessories.
- RAISED STRING-LIKE RIDGES – Unlike typical strength training grip strengtheners, this exclusive patented design includes raised ridges that simulate real string tension to help build calluses—ideal for realistic guitar finger exerciser practice.
- MIRRORS PLAYING POSITION – Ergonomically shaped to replicate your hand and finger angles while playing any stringed instrument, making it a versatile tool to build calluses where you need them
- HIGHEST TENSION AVAILABLE – Choose from 8-lb (RED) or 15-lb (BLACK) resistance. The BLACK version delivers extreme resistance—unmatched by any other guitar finger trainer or hand exerciser on the market.
- PERFECT HOLIDAY GIFT & STOCKING STUFFER – A thoughtful holiday gift that shows you support their musical journey. The ideal add-on for anyone receiving a new guitar! Compact, affordable, and fun to use — musicians of all ages LOVE this in their stocking.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0CHBG37Z5 |
| Best Sellers Rank | #993 in Musical Instruments ( See Top 100 in Musical Instruments ) #12 in Guitar Tools #235 in General Musical Instrument Accessories |
| Brand | Fender |
| Brand Name | Fender |
| Color | Black |
| Customer Reviews | 4.5 out of 5 stars 298 Reviews |
| Item Type Name | Callus Builder |
| Item Weight | 3 Ounces |
| Manufacturer | Barrett Productions, LLC |
| Material | Plastic |
| Style | Standard |
| Tension Level | Heavy |
| Tension Supported | Heavy |
| UPC | 891922002223 |
| Warranty Description | NO |

## Product Details

- **Color:** Black
- **Material:** Plastic
- **Brand:** Fender
- **Item Weight:** 3 Ounces
- **Style:** Standard

## Images

![FENDER Patented Callus Builder & Finger Strengthener – Resistance Finger Exerciser for Guitar, Bass & Violin – Guitar Finger Trainer & Grip Strength Tool – Ideal Guitar & Bass Accessories (Tensions: RED=8-Lbs; BLACK=15-Lbs) - Image 1](https://m.media-amazon.com/images/I/71LM2OwHkLL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works as advertised!
*by C***M on February 4, 2026*

It has a magnetic on the back, it's also a potato chip bag clip ( too funny but true) It has strong resistance and starts to build calluses on fingers after just a few days!

### ⭐⭐⭐⭐⭐ Great product and purchase 👌
*by H***I on January 17, 2026*

Easy to use! Already feeling the finger tips getting the work out! After two days Great product 👌

### ⭐⭐⭐⭐⭐ Great for building calluses
*by K***E on January 7, 2026*

I’m a professional orchestral musician and I bought this to keep my calluses up when I’m away from my instrument. After a couple of weeks of using this my calluses were bigger than ever and my hand strength is also up. The black strengthener is probably more intense than a guitarist would ever need, but this device perfect for working professionals who play everyday.

## Frequently Bought Together

- FENDER Patented Callus Builder & Finger Strengthener – 15-lb Resistance Finger Exerciser for Guitar, Bass & Violin – Guitar Finger Trainer & Grip Strength Tool – Ideal Guitar & Bass Accessories
- D'Addario Accessories Hand Exerciser–Improve Dexterity and Strength in Fingers, Hands, Forearms- Adjust Tension Per Finger– Simulated Strings Help Develop Calluses- Comfortable Conditioning
- Rock Tips Liquid Callus Formula for musicians

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**Shop now:** [https://www.desertcart.dk/products/565419617-fender-patented-callus-builder-and-finger-strengthener-resistance-finger-exerciser](https://www.desertcart.dk/products/565419617-fender-patented-callus-builder-and-finger-strengthener-resistance-finger-exerciser)

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*Product available on Desertcart Denmark*
*Store origin: DK*
*Last updated: 2026-03-08*