LANDMINE is designed to eliminate moisture for large size of gun/knight safe. (About 150 cm) .With mine looking, it brings users to get involved in the simulated battlefield. Placing it in a case can effectively reduce the humidity level. In the gun/knife case, LANDMINE could absorb moisture so that your gear in the case would be never rusty or moldy. After 1 month of using it, it would absorb full of moisture, you could hear it by microwave for about 3-4 minutes. Then it will recover absorbing capability.