Liberty Safe Hydrosorbent Silica Gel protects firearms from condensation, rust, and mildew by absorbing dampness from inside your gun safe or enclosed storage area. This moisture absorber requires no electricity and remains dry to the touch, even when saturated. The built-in indicator turns from blue to pink to signal when its time to reactivated. The Liberty Safe Hydrosorbent Silica Gel tab is reusable and can be reactivated by placing in an oven to dry out. The 99% silica gel/5% cobalt chloride blend is contained in a metal housing. Seek emergency procedures if inhaled or ingested. 4L x 2W x 1H. Available: 40 gram, 450 gram. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Silica Gel.