DURABLE & STURDY: This 520 ml tumbler is made of premium 304-grade Stainless Steel inner and 201 Grade Outer. This is rust-proof, scratch-resistant with a 304-grade stainless steel straw. It is corrosion-resistant. FUNCTIONALITY: This sipper measuring 17.2 cm (H) x 10 cm (W) x 6.8 cm (D), fits perfectly into most car or bag cup holders, making it versatile. It comes with a stainless steel straw for easy sipping. INSULATED: This tumbler with lid is vacuum insulated and keeps your beverage hot and cold for up to 6 hrs. EASY TO CLEAN: The tumbler with lid has a wide mouth which aids in cleaning after every use. QUALITY-TESTED: This tumbler has been tested by the French company Bureau Veritas for material safety & insulation performance. It is free of all toxic chemicals like lead and cadmium, & BPA. Variation