LOCKDOWN Silica absorbs moisture from the air inside avault or storage area preventing condensation, mildew and rust from damaging valuablefirearms. Crystals change color once fully saturated and can be easily recharged in the oven. Absorbs moisture from the air Easily recharged in oven Durable vented can provides protection for up to 57 cubic feet Breathable bag provides protection for up to 33 cubic feet Silica Gel 750g