Fellow Big Jo is an elegant, double-walled mug. The capacity is 350ml (12oz). Perfect for both coffee- and tea-lovers. The double wall helps to maintain the temperature of the drink, either hot or cold. The outer wall does not get hot, so it is safe to hold the glass in hands. A combination of ceramics and copper is eye-catching and will satisfy every fan of great design. The mug is hand washable only.