Durable Material: The crutch tips are made of high quality thickened rubber material, wear resistant, good toughness, sturdy and durable. Non Slip Bottom: The bottom of the cane tip is made of an imitation tire pattern, which has a better anti skid effect, and prevents accidental slippage. Reinforced Gasket: Crutch feet cap, built in metal gasket, puncture proof and durable to use. Widen Design: The cane tips are well made, and the wide bottom will greatly add extra stability and good traction, suitable for walking on rough pavement or loose terrain. Wide Application: Crutch tip replacement, widely fit seniors walking crutches, canes, walking sticks, and hiking sticks. Specification: Product Size: Bottom Diameter x Height (Optional) Black 14mm Aperture: 3.3cmx3.1cm/1.30inchx1.22inch Black 16mm Aperture: 3.3cmx3.1cm/1.30inchx1.22inch Black 19mm Aperture: 4.1cmx5.3cm/1.61inchx2.09inch Yellow 19mm Aperture: 4.1cmx5.1cm/1.61inchx2.01inch Black 22mm Aperture: 4.1cmx5.1cm/1.61inchx2.01inch Yellow 22mm Aperture: 4.1cmx5.1cm/1.61inchx2.01inch Yellow 25mm Aperture: 5.3cmx4.4cm/2.09inchx1.73inch Yellow 28mm Aperture: 5.4cmx4.7cm/2.13inchx1.85inch Material: Rubber Package Includes: 4Crutch Tips Note: Please allow slightly errors due to manual measurement and different monitors.