High-Performance: The tire grain design of the bottom provides enhanced slip resistance, strong grip, effective drainage, and efficient exhaust. Wear-Resisting: Built-in steel cushion reinforces the tips. Offers wear resistance up to three times that of standard natural rubber. Designed with a tread pattern similar to a car tire for improved ground contact. Features strong adhesion, excellent grip, efficient exhaust, and superior drainage properties to help ensure user safety during walking. Specification: Material: Rubber Size Chart: 16mm Inside Diameter: Approx 1.6 cm / 0.63 inch Height: Approx 4.5 cm / 1.78 inch Bottom Width: Approx 3.5 cm / 1.38 inch 19mm Inside Diameter: Approx 1.9 cm / 0.75 inch Height: Approx 5 cm / 1.97 inch Bottom Width: Approx 3.6 cm / 1.42 inch Package Includes: 4 Pieces Rubber Crutch Tips Note: Size may vary slightly due to manual measurement; a difference of 0 to 1 cm is considered normal. Due to differences in monitor displays, the actual color of the item may vary from the image shown.