The Richell S-2 straw set is made of silicone rubber and can withstand temperatures from 140°C to -20°C. - Brand: Richell - Model: S-2 - Accessories: Straw set - Material: Silicone rubber - Operating temperature: 140°C to -20°C Thank you for viewing. I am selling this because I have a surplus after using one set. When shipping, the box will be folded and shipped with the product. We appreciate your understanding and look forward to your purchase.