Protect your firearm (or any other valuables) from the destructive effects of moisture with this HornadyA(R) Rapid Dry Dehumidifier Stone. Advanced patented material absorbs moisture over time. Indicator window shows amount of moisture collected by slowly changing from white (dry) to blue (wet, needs recharging). Quickly recharges (discharges moisture) in the oven or microwave for unlimited use. Protective rubber cover prevents bumps or scratches to your firearms Recharges after 1 hr. in oven, or 9 minutes in microwave Recharges in oven or microwave for unlimited use Fits gun cases, safes, tool chests, or similar enclosed areas Color indicator shows when stone needs recharging