Material type: 304 Stainless Steel; No. of pieces: 1; Capacity: 375 ml. Insulation type: Double wall; Temperature retention: Yes ; No sweat Exterior (Keeps liquid hot/cold upto 6 hrs hot 12 hrs cold); Leak proof: Yes; Wide Mouth for easy cleaning. Inner and Outer side of mug is made from 304 Grade Steel which is Rust Free and 100% Food Grade. Lid comes with safety lock, BPA free material lid with Edible PP material