Footrests for upright pianos. These are insulators with soundproofing and vibration-damping effects. Made of smart, resilient special synthetic rubber, ideal for pianos. The underside is felt fabric. - Quantity: 4 pieces - Material: Special synthetic rubber - Underside material: Felt Each weighs approximately 670 grams, providing a solid weight. Diameter is approximately 13 cm (see photo). The diameter for the piano leg is approximately 6 cm (see photo). Used for soundproofing and earthquake resistance. These are used items, so there may be some scratches and dirt, but they are in good working condition. Thank you for looking.