Features 1、Made of high-quality ABS, 4 cups in 1 package. 2、Excellent load bearing capacity, support piano of about 300kg. 3、Protect wheel of piano from rusting. 4、Protect floor from scratch causing by piano. 5、Designed for upright piano. Specifications: This item includes four cups that are featured by their excellent load bearing capability. They are designed for upright piano. They can support piano of about 300kg and provide conservation for both piano and floor. Features: Made of high-quality ABS, 4 cups in 1 package. Excellent load bearing capacity, support piano of about 300kg. Protect wheel of piano from rusting. Protect floor from scratch causing by piano. Designed for upright piano. Specifications: Material；ABS Quantity: 4 Inside(concave part) diameter: 5.3cm / 2.1in Outside diameter: 9cm / 3.5in Product weight: 25g / 0.9oz Package size: 19 * 13 * 5cm / 7.5 * 5.1 * 2in Package weight: 120g / 4.2oz Package List: 4 * Cup Package List 4 * Cup