The reusable straw is made from the premium food-grade 304 stainless steel that can stand against scratch, rust and crash. Each set includes reusable straw, telescopic scrub brush, plastic case, silicone cover and carabiners. The telescopic straw can be packed into the small plastic case and you can tie the case to your belt or bag with the attachable keychain option. The soft silicone cover protects your teeth and tips from getting too cold or too hot.