I Love My Cat Mug, Cat Mug, Gifts for Cat Lovers, Pet Coffee Cup, Ceramic Mug, Pet Gifts By Tumbleweed Tumbleweed Coffee Mug is Microwave Safe. Careful: sometimes mugs can be hot. Handle all hot objects with caution. All Tumbleweed Mugs hold approximately 20 ounces, perfect for coffee, teas, and hot chocolate.May vary slightly. Made From Quality, Durable Ceramic, This Is The Perfect Drinkware Mug Or Office Decor Mug To Hold Pens, Pencils, Paperclips And Candy. Large coffee mug, measuring approximately 3 3/4 inch top rim diameter x 4 3/4 inches tall; ideal for holding your favorite beverages safely. Microwave Safe. Careful: sometimes mugs can be hot. Handle all hot objects with caution.