1.[Applicable size range]: Please measure the round chair leg diameter and pick the size that matches: X-Large: 1.46'-1.77'(37mm-45mm), Large: 1.14'-1.42'(29mm-36mm), Small: 0.87'-1.10'(22mm-28mm), X-Small: 0.63'-0.83'(16mm-21mm) 2.[Prevent Scratches & Reduce Noise]: The chair foot covers have a 360° wrapped felt bottom, ensuring the felt bottom touches the floor at any angle. The felt pad reduces resistance and eliminates harsh noises caused by bulky furniture. Glide furniture effortlessly without scratching precious flooring and enjoy a peaceful ambiance 3.[Easy to install and washable]: The chair leg protectors are easy to install and no tools required. Just slip them over the bottoms of the chair feet and stretch them over the leg. They'll fit firmly in place and not easily fall off. Can be directly washed with water after disassembling if they get dirty 4.[Not fall off & ]: The chair foot covers adopt an integrated design that combines felt and silicone, ensuring the bottom felt never falls. The inner wall is thickened to 2mm, providing enhanced abrasion resistance and pull resistance. Protect precious hard surfaces and tile floors with confidence