These are stearate (non-stick) coated industrial discs, commonly used in woodworking shops.
They are constructed with a unique blend of aluminum oxides and the incredibly durable, synthetic ceramic mineral, Cubitron.
Purple abrasives are 3M’s best performing class of abrasives.
Both more durable and faster cutting than other discs, they provide the greatest dollar value and the highest quality in abrasive minerals available.
Faster cutting increases productivity, while long-lasting abrasive particles reduce disc consumption — so you spend less time changing sandpaper and more time sanding.