SILENT DRY is a new devision and brand name under DRYTECH CORP., LTD. SILENT DRY Dehumidifier Stones are designed for gun storage regarding the Shooting Industry. Our dehumidifier stones are made with special absorption material that holds patents worldwide and are approved with SGS, EU REACH and US California 65 certificates, which are biodegradable, Non-toxic and Eco-Friendly. Most important, unlike electric renewable dehumidifiers that need hours to renew that are commonly seen in the market. SILENT DRY Dehumidfiier Stones can simply be renewed by microwave within only a few minutes.