Material: Inner Made of 304 Stainless Steel + Food Grade Plastic + Food Grade Silicone.

Made of high quality food grade 304 stainless steel, it's anti-corrosion and rust prevention.

Used the vacuun-seal technology and double-wall construction, vacuum insulation for maximum temperature retention, keeping drinks hot for as long as 24hrs and cold for 6hrs .

It's not easy to rust, corrosion and easy to clean.

A very useful one hand open lid, with food grade silicone stopper and silicone sealing ring, resistance high temperature, resistance aging, strong seal, durable used and unbreakable.