Robust and durable The rubber is made of high-quality TPR (thermoplastic rubber), which promises a cushioning effect when walking on asphalt and prevents annoying noises on hard floors. Standard size : these tips have an 11mm diameter hole and are designed to perfectly fit most hiking poles Protects the poles and the environment: these replacement tips prevent premature wear of the tungsten tips and protect also environment, as they minimize the formation of scars on the ground and prevent damage to nature Set of 10 pieces / 5 pairs of rubber replacement eartips - Always take your spare eartips with you because it is always a good idea to avoid with a few extra tips, especially on long rides Built-in Metal Washers: Increases the life of the rubber tips by adding an extra layer of metal that prevents the metal tip from hit the rubber