Trampoline cover --- Attach the trampoline safety net to the top of the pole (without safety net). Replacement part --- The pole cover is specially designed for shell poles with a diameter of 25 mm. Durable material: the trampoline cover cap can hold the safety net straps and prevent the pole from slipping. Easy installation: special hook for easy attachment of the net with the housing rod. Helps secure your trampoline safety net to the top of your poles. Package includes: 12-piece blue trampoline cap, easy to use and replace that could meet your needs. Colour: blue Material: plastic Package Contents: 12 x Trampoline End Caps Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.