This design is printed with eco-friendly plant-based inks directly on the stainless surface. Tumblers include BPA-free leak resistant, easy-to-clean and easy-close slider 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. Towel dry immediately to help preserve decoration. Do not soak or use cleaning materials (bleach, chlorine, etc.) and do not put in dishwasher, freezer or microwave. Stainless steel tumblers and bottles feature a limited 5-year guarantee, are Made in China and printed in Venice, FL.