1. IMPROVES WALKER GLIDE MOBILITY for any senior or movement-challenged person over time. Walker Balls use real tennis balls with premium grade felt, which glides optimally over doorways, sidewalks and carpets where other coasters get stuck.2. PRE-CUT STAR TOP OPENING for and UNIQUELY SECURE FIT - why risk injury or waste time cutting old balls. Our specially engineered cut pattern allows for much a better fit then any other walker balls on the market.3. PROTECT YOUR FLOORS FROM SCRATCHES - Unlike plastic walker glides, our custom cut walker balls set of 2 will never cause scuff marks, nor nick or scratch your precious hardwood, linoleum, or Pergo floors. Glide easily across most surfaces.4. CHOOSE YOUR STYLE and express your personality with not the same old boring yellow, blue or purple, but choose from four animal prints(Zebra, Tiger, Cheetah, and Leopard.)5. SUPER EASY TOOL-FREE INSTALLATION - Easily slides onto 1 1/8"" tubing of most walkers easier with no additional tools necessary. And, we use actual tennis balls, not cheap toys, allowing for maximum durability, to sustain long term use.