The RamblerA(R) Stackable Mug is built for the morning coffee ritual and every adventure that follows. Engineered with the DuraSip(TM) Ceramic Lining fused to kitchen-grade 18/8 stainless steel, this mug offers a non-stick, no-mess interior that resists staining from highly acidic beverages while remaining tough enough to withstand drops and tumbles. Like the rest of the RamblerA(R) family, it features double-wall vacuum insulation to ensure your favorite drink stays hot or cold until the very last sip. Features DuraSip(TM) Ceramic Lining: A non-stick interior that resists staining from coffee and acidic drinks, fused directly to stainless steel for maximum durability. Double-Wall Vacuum Insulation: Provides superior temperature retention to keep hot drinks hot and cold drinks cold. Rust and Puncture Resistant: Constructed with 18/8 stainless steel to handle the rigors of the outdoors. 360-Degree Welded Handle: Delivers a firm, comfortable grip on your beverage and is built to withstand impact. Stackable Design: Engineered for easy storage whether you are in the kitchen or packing for a trip. Dishwasher Safe: Built for convenience because no one needs more work to do after a long day. Specifications Empty weight - 1.00 lbs. Dimensions - 5.1" W x; 4.5" H (13.0 W x; 11.4 H cm).