The 3″ Sanding Accessory pack is supplied in 3 grades, these sandpaper discs are designed to fit Velcro 3” (75mm) backing pads.
 
Features, Benefits and Specifications:
Felt sides for easy fit to the backing pad
High grade sandpaper pads for a professional finish
10 x 3 different grades to cover all situations
 
Grades included in pack: 320, 400 & 600