Product Information. Name: Diatomaceous earth waterproof non-slip drainage mat. Size: 13 x 38 CM. Material: diatomite. Features: Soft and comfortable, skin-friendly material. Absorbs water quickly and does not leave water stains. Strong anti-slip performance. Printing process, fine workmanship. Mainly used in kitchen sinks around, play a waterproof, non-slip, water absorption and decorative effect.