Can I put my Monty Milk Art Cup in the microwave? May 15, 2023 17:04 Updated Monty Cups are NOT microwave-safe. These cups contain interior metal components so we advise against microwaving them. Related articles Are Monty Milk Art Cups dishwasher-safe? Is your double-walled glassware dishwasher safe? Are the Monty Milk Art Cups compatible with the AeroPress/Prismo? Is the Mighty Small Glass Carafe microwave safe? There is moisture between the walls of my glassware.