Double vacuum stainless steel insulation mug, using shatter proof 100% 18/8 stainless steel material inside and outside, with liner copper plating. 85mm large diameter bottle, easy to clean - does not retain smells and odors, great alternative to plastic bottles and cups. plastic free, paint free, BPA Free & eco-friendly. Reusable - buy one and last a lifetime. This mug prevents condensation, which means no more slippery grip or water stains. The outside stays dry. No need for a coaster. Integral sealing plug, there's no need to worry about spills, stains or burns from hot drinks.