Royal Stafford Grenville Mug Handled mug Made in the u.k Dishwasher safe Microwave Safe Measures 3.5 Royal Stafford has been in business for 167 years; British Design and Manufacture Traditional and Contemporary Inspired designs are versatile for any taste Heirloom quality Durable glaze, fired to 2066-degree F the same as porcelain Dishwasher and Microwave Safe