best acrylic brushes these are 100% kolinsky hair and are available in sizes 12, and 14. These are round and areNOTCRIMPED. The bristles are fuller, thin and longer which allows you to pat and pull the product and extends the life of your brush without acrylic accumulating in the bristles. Round brushes actually help to get clients cuticle and sidewall area thin as possible. If you prefer a fullycrimpedferrule, you can crimp them carefully using pliers.