That little black cap is great if you want to remove the tip section from the body when you store it in your pack. (which I do) - It ensures that the brush won't leak. Sakura has them and of the ones I've tried they are my favourite because they do great detail work plus they are long lasting. They hold their shape - whereas Derwent (for example) lost it's shape after a few usings.
That little black cap is great if you want to remove the tip section from the body when you store it in your pack. (which I do) - It ensures that the brush won't leak. Sakura has them and of the ones I've tried they are my favourite because they do great detail work plus they are long lasting. They hold their shape - whereas Derwent (for example) lost it's shape after a few usings.