6'' Soft Power Pad (Yellow) Used to sand surfboard rails and to shape blanks. The SOFT pad is the softest density.
6'' Medium Power Pad (Red) Used to sand surfboards and to shape blanks. The MEDIUM pad is the most versatile density and the most popular pad.
6'' Hard Power Pad (Blue) Used to sand surfboards. The HARD pad is used for flat areas, deck, bottom, and fins.
5 3/8" diameter. Fits any 5/8 X 11 pitch coarse-male thread arbor.