3PCS Piano Caster Cup Standard Size for Grand Piano Anti Shock Anti-slip

3PCS Piano Caster Cup Standard Size for Grand Piano Anti-shock Anti-slip BlackFeatures: Color:Black Bottom diameter: 98mm Groove diameter: 58mm Material: ABS engineering plastics Avoid the piano the wheel contact directly with the ground, Scattered piano wheel bearing area and protect the floor from the piano wheels crush. An excellent way to help prevent indentations in your flooring due to the extreme weight from a piano's wheels or legs. To make the piano more stable and aviod being moved easily by outside influence Not designed to accomodate pianos with double wheels. Antiskid,moistureproof,absorbing shock and sound insulation. Package Included: 3 X Piano Cups for Grand Pianos