Material: The elastic band is made of high-quality rubber. The hook is made of high-quality plastic. It is resilient and weatherproof. Extender with hooks features: Multifunctional rubber tensioners help keep the tent stable. 25cm elastic band with hook stretches to 50cm. The tarp tensioner has a plastic hook that holds it securely in place. Rubber tensioners with hooks uses: Suitable for tarps, camping, boat sheds, tents, gardens, railings, caravans, and commercial applications. Bungee cord with hook mount: The tarp tensioner easily threads through grommets and supports, then locks onto the hook. Multiple cords can be used together to add length. Color: Black Material: Rubber Size: Approximately 25cm Package contents: 50 x Bungee cords with hooks Note: Only the items listed are included. Other products are not included. Note: Light reflection and different displays may cause slight color variation compared to the actual item. Measurement error allowance is +/- 1-3cm.