how long are these when closed?

When the case is closed it is 140mm.

Are these brushes synthetic or Kolensky Sable

Well, I did make a video but I guess it was too long. Yes, the the brushes are really pure kolinsky sable. I don’t know the price now, but I remember they were a very good value. Sadly, I don’t use them much. Guess I should try again, but my opinion was they were not springy enough for me. I bought a really inexpensive set of 4 AIT select which comes in an adorable case. It doesn’t have a belt loop. I am not sure if they are synthetic or a blend. The brush tubes are not as good but then German engineering is in a class by itself. In the end, I bought a third set of 3 then added a fourth size of silver black velvet brushes which I adore and put them in the AIT case. Even though they will produce a nice wash as they are squirrel hair, the point is amazing. The point holds up much better than any of my kolinsky’s do, especially if you are heavy handed. I know I’m supposed to be selling you on the kolinsky. Certainly everyone should try them. Raphael #8408 will always be my favorite, but I also love Billy Showell’s new line of synthetics although they don’t come in a travel brush and are great for lines but aren’t as wide as the black velvet so you won’t get a really wide wash if you need that. I wish I could tell you how many travel brushes I have but it would be embarrassing. I am kind of an experimenter. It’s kind of a discovery/research thing with me.

Can I use them for oil painting?

Unfortunately I believe not. I am not an oil painter but a Watercolorist, even though these brushes are durable and firm they have softer bristles than an oil brush typically has. Plus I know that oil paint in very thick, I m not sure how painting with these brushes would work with oil paints due to the fact I am not an oil painter. I know that watercolor is very translucent transparent and more fluid. I see there is a product brush similar to this one on Blick Art Materials here https://www.dickblick.com/products/da-vinci-russian-red-sable-watercolor-brushes/ they are stating the brushes are good for the mediums Great for watercolors, gouache, illustration, animation, restoration, and rendering, Da Vinci Russian Red Sable brushes are high-quality brushes and an excellent value. I do not see oil paint on the list. I hope that helps!? If you need more help you can always call Blick Art Materials and speak with customer service and or an artist whom specials in art supply knowledge information at customer service 800-723-2787 or product info at 800-933-2542.

what are the bristles made out of?

The Kolinsky travel set 2 claims to be Kolinsky bristles, but they must be synthetic. The perform soooo badly. I have other kolinsky brushes and these don't behave the same way at all.

Colour	Black
Bristle Type	Synthetic
Material Type	Leather
Size	30 x 30 x 30 cm
Paint Type	Watercolor
Handle Type	Rattail Griff

5382-1573 Series Travel Brush Case Set, Leather, Black, 30 x 30 x 30 cm

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