Material: Solid Wood - Genuine Black Walnut, Sapele (African Mahogany), Zebrawood, Rosewood/Jacaranda, Oak Wood for options. Piano Leg Protector - Prevents metal and brass casters from rusting or tarnishing. Designed for upright piano - Set of 4 pieces. Protects Floors and Carpets - The bottom of each cup is lined with non-slip felt for floor protection as well as insulation and anti-slip. Natural Wood Grain Difference - You will notice a slight color difference on each cup, which is due to the real wood grains. Solid Hardwood 100% Hardwood. High-quality wood holds the piano in place, reducing pressure on the floor and protecting the wood and carpet from damage caused by casters. Shockproof EVA Foam Mat EVA foam mat absorbs vibrations and reduces noise without scratching the floor Elegant Design Piano Caster Protector: Protects metal and brass casters from rust and tarnishing. Enhances the piano and the room, giving it a truly chic look.