Flap Wheel Grit 14"x2" 150 220 320 400 200 pcs of each size 600 12x2 150 220 400 600 the first one is size in inches. i.e. 14" is dia of flap wheel and 2" is the depth. The second one is grit...means the fineness of paper used to make flap wheel. the thrird one is quantity.