Astro Mini Mounted Brushes give you perfect, consistent finishes every time! Made with the highest quality goat hair, you will find they hold compound well. Try these star shaped brushes on intricate patterns and areas that a regular wheel brush can't quite reach. Mounted on a 2.38 mm (3/32”) diameter shank. Maximum 10,000rpm. Available in a 10 pack or 100 pack. Made in Germany.