Tumblers Product Information The Insulated wine tumbler is mainly produced by the combination of inner and outer double-layer stainless steel materials through vacuuming technology. The vacuum structure can effectively control the three heat transfer ways of heat conduction, heat convection and heat radiation to achieve the purpose of heat preservation, cold preservation and freshness preservation. In fact, the length of the heat preservation time of the vacuum thermos depends on the structure of the cup body and the thickness of the cup material. Generally speaking, the thinner the cup material, the longer the holding time. Features The Insulated wine tumbler has the function of keeping warm and cold. The functions of the ordinary thermos are relatively poor, and the effect of our vacuum tumbler is much better. In hot weather, we can use the tumbler to put iced wine or ice cubes in it, so that you can enjoy the cool feeling at any time, and can be filled with hot water in winter, so that you can drink hot water at any time. Details . Double wall stainless steel insulated vacuum design . Keep your favorite beverage cold/hot for hours . Food grade material, BPA free and reusable . Press-in Lid Product information Item No.:WG08- Material-Body:18/8 food grade stainless steel Material-Lid:AS Capacity:350ml /11oz Size:蠁88.8X111 mm Weight:173.00g +/- 3% Certificate:LFGB/FDA/SGS Color:Customized LOGO:Customized Packing:Customized or standard package with 36pcs/carton MOQ:3000pcs, open to talk Port:Ningbo, Shanghai Daily output:80,000pcs Lead time:Normal 40-55 days based on qty Payment terms:30% T/T deposit, 70% balance T/T against B/L copyTumblers website:http://www.hdflasks.com/tumblers/