Features: Suitable for upright pianos. Protect your piano wheels or legs from sliding and rusting, make your piano more stable. Be delicately made of acryl and EVA, lifelike rose wood pattern on the top, very beautiful. The thickness of EVA anti-slip mat on the bottom is 3mm, thick enough to provide good sound insulation, shock absorption, skid resistance and to protect your floors. Excellent toughness, with fine pressure endurance, almost unbreakable. 4 pieces per box. Specifications: Model: PA-9 Color: Rose wood color(top) & Black(bottom) Material: Acryl and EVA Inside Diameter(concave part): 4.7cm / 1.85in Outside Diameter: 10.2cm / 4.02in Item Weight: 180g / 6.4oz Package Size: 10.5 * 10.5 * 11cm / 4.1 * 4.1 * 4.3in Package Weight: 218g / 7.7oz Package List: 4 * Upright piano caster cup Note: Piano is not included.