WHAT'S INCLUDED: A set of 4 balls. READY TO USE: Pre-cut opening makes it easy to put onto walkers. Just slip the walker balls on and go. No tools required! PROTECT FLOORS: Recommended for indoor use to protect floors from being scratched and scuffed by walkers. GLIDE SMOOTHLY & QUIETLY: Our walker balls were designed to glide smoothly and quietly across most surfaces, allowing you to discreetly move around. FITS MOST WALKERS: The RMS Walker Balls fit most walkers with standard 1 inch tubing. RMS Walker Glide Balls allow walkers to glide easily over floors. They glide smoothly & quietly across most surfaces and make movement easier. Recommended for in-door use. They are more durable and safer than tennis balls. Pre-cut and ready to use.