We are in love with these. No, seriously. They are great at removing heavy oxidation or even paint from aluminum extrusions.
We sell them in three sizes and three grits. The little bristles are made of rubber mixed with abrasive grit. They wear down with use.
Price is each. Yes, they are pricey but they are SO worth it.
They use a Roloc style attachment. Black rubber Roloc holders for mini die grinders are sold separately.
Choose a variety for all applications.