---
product_id: 1609460
title: "4.6\" US box center fin Safety Flex Soft replacement for longboard SUP Stand up Paddleboard River Surf Whitewater airSUP AIR7 by saruSURF"
brand: "sarusurf"
price: "599 kr"
currency: DKK
in_stock: true
url: https://www.desertcart.dk/products/1609460-4-6-us-box-center-fin-safety-flex-soft-replacement
store_origin: DK
region: Denmark
---

# Flexible TPU material Stainless steel screw 4.6" size 4.6" US box center fin Safety Flex Soft replacement for longboard SUP Stand up Paddleboard River Surf Whitewater airSUP AIR7 by saruSURF

**Brand:** sarusurf
**Price:** 599 kr
**Availability:** ✅ In Stock

## Summary

> 🌊 Ride the waves with confidence and style!

## Quick Answers

- **What is this?** 4.6" US box center fin Safety Flex Soft replacement for longboard SUP Stand up Paddleboard River Surf Whitewater airSUP AIR7 by saruSURF by sarusurf
- **How much does it cost?** 599 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/1609460-4-6-us-box-center-fin-safety-flex-soft-replacement)

## Best For

- sarusurf enthusiasts

## Why This Product

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

## Key Features

- • **Safety First:** Perfect for beginners and kids, ensuring a safer surfing experience without sharp edges.
- • **Easy Adjustments:** No tools needed! Adjust your fin position effortlessly, even while on the water.
- • **12-Month Warranty:** Enjoy peace of mind with our one-year warranty, because we stand by our product!
- • **Findestructible Design:** Experience the ultimate durability with our Safety Flex Soft fin that bends but never breaks!
- • **Universal Compatibility:** Fits most longboards and SUPs, making it the go-to fin for every water adventure.

## Overview

The SaruSURF 4.6" Safety Flex Soft fin is a revolutionary replacement fin designed for longboards and SUPs. Made from flexible TPU plastic, it offers unmatched durability and safety, making it ideal for surfers of all skill levels. With a universal fit and easy installation, this fin is perfect for both beginners and advanced users looking to tackle various water conditions.

## Description

4.6" US box center fin Safety Flex Soft replacement for longboard SUP Stand up Paddleboard River Surf Whitewater airSUP AIR7 by saruSURF

## Features

- SAFETY FLEX SOFT 4.6" FIN - under most conditions this gummy fin is impossible to break , 12 month warranty , we call the fin "findestructible" !
- FOR LONGBOARD , SUP AND INFLATABLE SUP ( inflatable sup boards with AIR7 fin box or US box - contact us to confirm if not sure) suitable for use with most longboard / (stand up paddle) SUP / airSUP. most long board and stand up paddleboards use the universal fin system, which can take this replacement fin.
- GREAT FOR SURFER AND ADVANCED SUP : surf dumping shore breaks, shallow reefs. On your SUP : challenge white water, low level streams, river runs and fly fish in shallow lakes. This fin is flexible , in most conditions will not break, and less likely to break out your board's fin box!
- GREAT FOR BEGINNER AND KIDS : 1st time surfing can be dangerous, usually the fin is the sharpest part of you board, with this fin you can feel safer - the fin will bend and flex more and is harder to hurt yourself and others
- STAINLESS STEEL FIN SCREW (included with this fin) saruSURF brand US box center fin screw, no need to screw drivers, adjust your in position (forward, backward, take it off) anytime even out on the water!

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | SaruSURF |
| Color | Semi transparent yellow |
| Material | TPU plastic |
| Sport | Surfing |
| Item Dimensions LxWxH | 7.87 x 0.79 x 4.61 inches |
| Skill Level | Beginner |
| Age Range (Description) | Adult |
| Strap Type | Ankle |
| Item Package Dimensions L x W x H | 9.92 x 5.28 x 0.91 inches |
| Package Weight | 0.32 Pounds |
| Brand Name | SaruSURF |
| Country of Origin | China |
| Suggested Users | Unisex-child |
| Manufacturer | saruSURF |
| Part Number | SS-FF46 |
| Size | 4.6" |

## Images

![4.6" US box center fin Safety Flex Soft replacement for longboard SUP Stand up Paddleboard River Surf Whitewater airSUP AIR7 by saruSURF - Image 1](https://m.media-amazon.com/images/I/71vR9FcFpPL.jpg)
![4.6" US box center fin Safety Flex Soft replacement for longboard SUP Stand up Paddleboard River Surf Whitewater airSUP AIR7 by saruSURF - Image 2](https://m.media-amazon.com/images/I/71FfyMillWL.jpg)
![4.6" US box center fin Safety Flex Soft replacement for longboard SUP Stand up Paddleboard River Surf Whitewater airSUP AIR7 by saruSURF - Image 3](https://m.media-amazon.com/images/I/71yTN-qKvLL.jpg)
![4.6" US box center fin Safety Flex Soft replacement for longboard SUP Stand up Paddleboard River Surf Whitewater airSUP AIR7 by saruSURF - Image 4](https://m.media-amazon.com/images/I/41YR4GqvcYL.jpg)
![4.6" US box center fin Safety Flex Soft replacement for longboard SUP Stand up Paddleboard River Surf Whitewater airSUP AIR7 by saruSURF - Image 5](https://m.media-amazon.com/images/I/61nMovqAAsL.jpg)

## Available Options

This product comes in different **Color** options.

## Questions & Answers

**Q: Will this fit an irocker cruiser?**
A: This fits iRocker’s eariler model blackfins. Mine is a 2019. I believe the US fin box had been replaced on the blackfin paddleboards newer than 2019. So I don’t think/know if it would fit any new iRockers.

**Q: Is this fin still installed with the screw in the front and the pin that slides along the shaft towards the back (stern) of board!**
A: There are photos of the fin installed on the amazon product page. The pin is in the front, the screw is in the back.

**Q: Does this come with the ‘no tool’ fin screw? One place says it does and another place says it does not.**
A: Yes, if you select the option with fin screw (usually the more expensive option)

No, if you select the option without screw (see photos, and descriptions)

**Q: I have a Riviera RP 12'6 . Was wondering if the it will fit ? Thanks**
A: Yes, this should fit your SUP

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**Shop now:** [https://www.desertcart.dk/products/1609460-4-6-us-box-center-fin-safety-flex-soft-replacement](https://www.desertcart.dk/products/1609460-4-6-us-box-center-fin-safety-flex-soft-replacement)

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*Product available on Desertcart Denmark*
*Store origin: DK*
*Last updated: 2026-02-26*