1. Silicone 2. Check the size before buying. The round chair leg floor protector fits furniture legs with a bottom diameter of 37-42mm. Check your leg diameters before ordering, make sure they are between 37-42mm. 3. Does not fall off - more than most self-adhesive felt pads. They hold the chair legs softly and firmly without falling off. 4. DURABLE AND FRICTION-FREE - The padded felt bottom base allows the chair to glide smoothly and quietly on any floor. Prevent scratches, scuffs or rough gratings. Helps protect tile and wood floors and furniture legs and makes moving chairs easier. 5. Superior Craftsmanship - Soft and durable silicone is fused with felt by heat compression. Thicker chair caps ensure greater durability and withstand the rigors of everyday use. 6. Color: Black. Shape: round. Material: Silicone and non-woven. Package includes 40 small chair leg floor protectors.