Specification: Material:felt exterior and a rubber interior Size:2.5inch Cross Cut size:2 inch Package Include: 4PCS Precut Walker Tennis Balls. Application:The soft felt exterior is quiet and perfect to help protect floors and reduce chair noise. ---- Our Walker Balls are made of a soft, felt exterior and a rubber interior. They glide smoothly & quietly across most surfaces. ---- These Walker Balls come pre-cut and ready to use. No need to cut them yourself. ---- Our Walker Balls help protect your floors from being scratched, and they come ready to use. Just slip them on and go!