This is a EAG1022000 9x11 2000G Waterproof paper. This is a Eagle Abrasives Silicon Carbide Flexible Back Waterproof Sheets. The world's most reputable wet sanding paper for it's durability, speed & extremely uniform abrasive grains. Sharp silicone carbide abrasive grain is resin-over-resin bonded on a highly flexible anti-slip backing which requires no pre-soaking before sanding.