The vacuum cup is made of high quality food grade 304 stainless steel, it's anti-corrosion and rust prevention.Used the vacuun-seal technology vacuum insulation for maximum temperature retention, keeping drinks hot for as long as 24hrs and cold for 12hrs . It's not easy to rust, corrosion and easy to clean. Anti slip bottle bottom and the reinforcement bottom, make the anti-breaking performance more stronger, and the bottom used concave and convex design, make the vacuum cup steadily. The durable water bottle handle features an innovative design and a flexible grip that fits securely around the neck of your bottle. Leak proof screw cap lid, with food grade silicone stopper and silicone sealing ring, resistance high temperature, resistance aging, strong seal, durable used and unbreakable.