7" x 7/8" P40 - P40 - 40 grit - P graded which provides more uniform finish than traditional Cami graded products - Sharp Silicon Carbide grain cuts fast while minimizing heat - Design for use on Glass, Mirror and Stone - Full resin on resin bond holds up to heat and moisture - 100% polyester waterproof Y weight backing - Packed 50 discs per box. 8 boxes (400 discs) per case. - Manufacturer: Sungold.