High-Performance: The tire grain design of the bottom is more non-slip, providing strong grip, strong drainage, and strong exhaust.<br> Wear-Resisting: Built-in steel cushion to reinforce the tips. Its wear-resistance is three times more than that of ordinary natural rubber.<br> Its design is similar to touch the ground at the bottom of a car tire texture shape.<br> Adhesion, grip performance, exhaust, drainage properties are strong,Effectively ensure the safety of the user walks.<br> Specification:<br> Material: Rubber<br> Size Chart:<br> 16mm<br> Inside Diameter: Approx 1.6 cm/0.63 inch<br> Height: Approx: 4.5 cm/1.78 inch<br> Bottom Width: Approx. 3.5cm/ 1.38inch<br> 19mm<br> Inside Diameter: Approx 1.9 cm/0.75 inch<br> Height: Approx: 5cm/1.97 inch<br> Bottom Width: Approx. 3.6cm/ 1.42inch<br> Package Includes:<br> 4 Pieces Rubber Crutch Tips<br> Note:<br> Size for manual measurement, there may be a 0 to 1 cm error, belongs to the normal phenomenon.<br> Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!