Super premium flask made of medical grade 316 stainless steel ? 316 grade steel used inside and 304 grade outside the flask ? Fully Vacuumized, retains temperature for 18-24 hours! ? Pull out silicon handle for comfortable grip, fold to merge back in ? Silicon ring on the cover for comfort of use ? Anti-scald mouth ring on top for ease of handling hot liquids ? Plastic parts made from 100% non toxic, food safe, BPA free Tritan ? Capsule shape, aesthetically pleasing design ? Capacity: 500 ml (approx) Colours Available: Yellow,White