Material: The elastic band is made of high quality rubber. The hook is made of high quality plastic. It is resilient, weatherproof, and corrosion-resistant. Extender with hooks Features: Multifunctional rubber tensioners keep the tent stable. 25cm elastic band with hook stretches to 50cm. And the tarp tensioner has a plastic hook that holds it in place nicely. Rubber Tensioners with Hooks USES: Our extenders with hooks are suitable for tarps, camping, boat sheds, tents, gardens, railings, caravans and commercial applications. Bungy Cord with Hook Mount: The tarp tensioner easily threads through the grommets and supports, then locks onto the hook. You can also wrap a few small rubber bands together to add length. Please note:There is a slight color difference or difference in kind, it does not affect the use, please do not mind, thank you! Colour:Black Material:rubber Size:about 25cm Package Contents: 50 * Bungee Cord with Hooks Only the above package content, other products are not included. Note: Light reflection 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.