Package Includes: Receive 4 elegantly crafted heavy-duty piano caster cups, perfect for grand pianos. Their polished appearance and sophisticated colors make them ideal for venues like music halls and hotel lobbies, and they're a thoughtful gift for piano enthusiasts. Designed for Grand Pianos: Each caster cup features a 2.5-inch inner diameter, accommodating both single and double wheel casters. Crafted specifically for heavy grand pianos, these cups ensure excellent load-bearing capacity and enhanced floor protection. Superior Construction: Constructed from durable metal and rubber with gold-plated internal steel plates, these caster cups are corrosion-resistant, pressure-resistant, and crack-free, ensuring longevity. The felt-covered bottoms add sound insulation and shock absorption. Effective Floor Protection: These robust metal and rubber caster cups distribute the weight of piano casters evenly, preventing direct floor contact. This design not only minimizes sliding but also protects floors and carpets from scratches and wear during piano movement. Versatile Use: Beyond pianos, these multifunctional caster cups can be used under office chairs, refrigerators, and other furniture with swivel casters to prevent sliding and protect floors. Ensure to check the size compatibility before application. Color: As Shown Material: Rubber Package Contents: 4*foot pads