Custom Mugs, Riviera Electric 11 oz Ceramic Mug - Microwave Safe, The Riviera Electric Mug pairs a matte exterior finish with a colorful glossy interior. It's microwave-safe so that you can conveniently reheat your favorite foods and beverages at the office or on the go. To clean the Riviera Mug 11oz, simply hand-wash with soapy water. Made from ceramic materials Microwave-safe Contrasting design with matte exterior and colored high-gloss interior Hand-wash only recommended ... #SM-6330 $4.16/each.