Non-Slip Anti-Skid Safe Bath - Ambient River Rock Shower Mat Square Non-Slip Suction Bathtub (Clear) Pebble design inspired by natural river rock. Strong suction cups keep mat securely in place. Square shape is perfect for showers!. Made of 100% allergen-free PVC. Machine washable. Dimensions: 21 long x 21 wide (54cm x 54cm).