• Durable material: Felt Furniture Caster Cups are made of high-quality aluminum plate. The design of the carpet bottom will not damage the wooden floor and will prevent scratches from the wheels. • Protects all floors: Use these furniture cups to protect any floor surface from scratches and dents from furniture with feet or wheels. • Easy to slide: Felt Furniture Sliders for hardwood floors protect your hardwood floors from scratches, move your furniture easily and safely! • Fits more sizes: We offer 4 sizes, 1 3/4" square, 2 1/2" square, 1 5/8" round, 4". The furniture pads are suitable for most furniture. • Easy to use: Simply slide them under your furniture, and then place the legs or wheels inside the cup.