Avengers Group 20 oz. Ceramic Mug The Avengers have assembled and are ready to kick some butt! Start off each day in a great superhero way with this Avengers Group 20 oz. Ceramic Mug. This fancy mug features Iron Man, Captain America, Thor, and the Hulk, and is able to hold up to 20 ounces of liquid. Hand wash only. Not dishwasher safe. Do not microwave.