It keeps the drink warm for up to 4 hours and cold for up to 8 hours. Quality double-walled stainless steel , 100% leak-proof, reusable. The diameter is 6.4 cm.  We recommend hand washing with a mild detergent. The plastic parts of the mug are also dishwasher safe. It is not suitable for use in the microwave or freezer. Model:  Ellipse Nordic Pink Colour: Pink Width: 17 cm Material Type: Synthetic Material: polypropylene, stainless steel