These bottles are good quality and have nice medium width square brushes. If you’re using them for nail oil, they’re perfect! The brush is soft and feels good on the skin. Having been said, if you intend to mix your own polish and need bottles to store it in, these may not be the right ones for you because they lack ball bearings. I used them for a polish mixing kit, and they store fine, the polish base doesn’t melt the brush or anything…but without those ball bearings, it won’t mix the polish to even out the formula. They’re a good value for what they are though, and fortunately ball bearings seem to be pretty cheap to get a hold of.