Gator 3287 Sanding Sheet, 11 in L, 9 in W, 1500 Grit, Mirror Fine, Silicon Carbide AbrasiveGator waterproof sanding sheets are designed for applications where wet sanding is required. The paper backing is specially treated to maintain its strength and shape even after being soaked in water for an extended period of time. The sharp, fast cutting silicon carbide grain works well on metal surfaces and between coats of paint, primers and sealers. Unit: PK 25 UPC: 082354042370 Model Number: 4237