MaterialThe walker ski glides are made of durable premium rubber material, wear resistant and durable. High quality glide caps provide better stability and comfort. Universal FitSet includes 1 piece walker ski glides replacement caps, fit all walkers with a post diameter 1 1/8" tubing diameter. Smooth Bottom DesignSled design durable walker glides provide a smoother glide and additional stability on any surface, helps reduce noise and will not scratch surfaces or snag carpets or rugs. Easy to InstallEasy to put onto walkers. No tools are required! More durable and scratch resistant than walker glide balls. Safety WalkingWalker Ski Glides are designed to inserted to the bottom of the legs of your walker to aid with smoother travel on most common surfaces, uneven floor. Walker accessories for indoor and outdoor use, ideal for home or public use. Specification: Material: Rubber Size: 8.3cmx5cm/3.27inchx1.97inch Type: Walker Glide Skis Tube Diameter: Approx. 28.6mm( 1-1/8 Inch ) Package Includes: 1 Walker Ski Glides Note: Please allow slightly errors due to manual measurement and different monitors.