- High-Performance: The tire grain design of the bottom is more non-slip, providing strong grip, strong drainage, and strong exhaust. - Wear-Resisting: Built-in steel cushion to reinforce the tips. Its wear-resistance is three times more than that of ordinary natural rubber. - Its design is similar to touch the ground at the bottom of a car tire texture shape. - Adhesion, grip performance, exhaust, drainage properties are strong,Effectively ensure the safety of the user walks. 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. 3.5cm/ 1.38inch 19mm Inside Diameter: Approx 1.9 cm/0.75 inch Height: Approx: 5cm/1.97 inch Bottom Width: Approx. 3.6cm/ 1.42inch Package Includes: 4 Pieces Rubber Crutch Tips Note: Size for manual measurement, there may be a 0 to 1 cm error, belongs to the normal phenomenon. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!