These 20oz mugs are laser cut to engrave your image or lettering. The double wall vacuum insulated tumbler is made of 304 food-grade stainless steel and the tumbler lid is made of AS, BPA-FREE plastic. Approximately warm for up to 6hrs and cold for about 12hrs. Dimensions: Tumbler height is 6.7"; Lid is 3.5"; tumbler bottom is 2.9" widening to 3.5" at the top. Leak and spill resistant as well as sweat proof. Fits most cup holders and is dishwasher safe.