Printed with eco-friendly plant-based inks or powder coated with BPA-free material directly on the stainless surface. Tumblers include BPA-free, leak resistant, easy-to-clean and easy-close lid. Triple insulation reduces condensation and keeps your drink hot for up to 8 hours or cold for up to 24 hours (use caution with hot liquids).Copper-lined 18/8 stainless steel construction is durable, and material won't retain tastes or odors. For best results, hand wash with soap, water and a scratch-free sponge.