Cynthia Fist Cup Brass Knuckle Duster Handle Coffee Mug Coffee Mug with Knuckle Handle Friendly design with unique metallic handle Widely used at home, in coffee shops, pubs, hotels, restaurants and offices 100% CUSTOMER SATISFACTION GUARANTEED - Cynthia guarantees that you will always be satisfied with your purchase from us. We only use the best materials for our products and are always available to aid our customers. WARNING - Do not put them in the microwave and do not wash by dishwasher.