Product descriptions from the supplier Product Description NEW KIDSTUMBLER Pro-grade Stainless steel18/8 PRO-GRADE STAINLESS STEEL DOUBLE-WALLBPA-FREEVACUUM INSULATION 18 HOURS COLDNO SWEAT12 HOURS HOTEXTERIOR COLORCUSTOMIZATION PRODUCTDETAILS Premium Silicone Straws The silicone straw is firm and hygiene, and thesize is perfect for kids to sip. Ergonomic Handle 100% leak-proof It also prevents leaks while thecap is on. The handle is designed for ournatural holding position and has asmooth, soft shape to providemaximum comfort for fingers andwrists. Safe Materials It is made of 18/8 stainless steel,fully resistant to oxidation, rust,and favor transfer. DROPRESISTANT Strong impact resistance No SweatExterior ALL AROUND FOR HOT & COLD