Caliber Gourmet Grenade Mug w/ Lid 22oz Black Ceramic. The grenade coffee mug is made of high quality ceramic is very durable and sturdy. You can pop the mug into the microwave to heat up a drink and put it in the dishwasher for easy cleanup please pull out metal ring before microwaving or dishwashing. Specifications for Caliber Gourmet Grenade Mug w/ Lid: Manufacturer: Caliber Gourmet Application: Outdoor Volume: 650 ml Color: Black Weight: 1.08 lb Package Contents: Caliber Gourmet Grenade Mug With Lid Caliber Gourmet CBG-M-1069: Grenade Mug w/ Lid 22oz Black Ceramic