Palisade Waterproof Interlocking Wall Tiles do not require grout and are 100% waterproof, making them ideal for moist environments. They are easily installed with nails or tube adhesive; simply interlock the edges. No special tools or saws are required, eliminating the need for contractors. The engineered rigid core technology provides warmth in a durable, scratch and UV-resistant tile. Use on drywall, OSB, cement board, purple board and wallpaper. Dark silver markings against a light gray base. Easy to clean.