Made with extremely durable, break resistant 3/16in thick PETG. Heavy duty construction all around. Choose from keyhole slots for wall mounting, or powerful magnets. Hinged Lid to keep dust out. Inside Dimensions: 5.5inch Wide x 5.5inch Deep x 7inch Tall. Outside dimensions: 5.9inch Wide x 5.9inch Deep x 7.25inch Tall. Holds a stack of masks or the whole box.