Material type: 304 Stainless Steel; No. of pieces: 1; Capacity: 400 ml Insulation type: Double wall; Temperature retention: Yes ; No sweat Exterior (Keeps liquid hot/cold up to 6 hrs. hot 12 hrs. cold); Leak proof: Yes; Wide Mouth 60mm for easy cleaning Inner and Outer side of mug is made from 304 Grade Steel which is Rust Free and 100% Food Grade. Strong handle, making grip comfortable and Leak proof screw Lid design with Silicon seal makes it spill proof. Best Usage: It Can be Used for Outdoor Sports/ Gym/ Work Trip/ Travel/ Office/School/College/Gym/Picnic/Home.