Not sure if this is quite small enough for what you're doing but I've been using these for detail work and I love them! Great value. They don't shed at all.

https://www.amazon.com/gp/product/B01IGQGQ9S/

Inclined to agree with those below, I think brushes that are a step or two up from the giant cheap "value packs" for students but aren't ridiculous are the way to go. I hate spending more than $5 a brush and have found brushes in that price range to be perfectly suitable.