THICK AND SAFETY PLASTIC MATERIALS: The plum trampoline top cap special "G" shape hook to keep the safety net straps firm into place and prevents from sliding down poleTRAMPOLINE TOP CAP ENCLOSURE REPLACEMENT: Helps to secure your trampoline (Safety Net NOT INCLUDED)STRONG, DURABLE SIMPLE & EASY ATTACHMENT: The trampoline top cap is easy to fasten screw thumb to pole cap by hand. These safety enclosure caps fit several trampoline brands.DURABLE TRAMPOLINE PLASTIC CAP - Thick and safety plastic materials Fit in 2.5-2.8cm diameter inner size of the trampoline enclosure pole.SIMPLE & EASY ATTACHMENT - Special C-shape hook to attach net with enclosure pole easily. Helps to secure your trampoline safety net to the top of your polesColour:blueMaterial:plasticPackage Contents:6 * Railing cap pipe capOnly the above package content, other products are not included.Note: Light shooting 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.