Brightboy Pumice Wheels, Tapered 3/8" Blue - Box of 100 For cleaning, polishing and finishing. Made from natural rubber with graded pumice grain evenly distributed to assure uniform results. The light action produces a smooth finish on soft metals. All holes are 1/16". Available in different shapes and diameters. 11-450 and 11-453 are square; 11-459, 11-461, and 11-463 are tapered. 11-463 is the white version of 11-461 and has more aggressive action. Sold by box of 100.