LOCKDOWN Silica absorbs moisture from the air inside a vault or storage area preventing condensation, mildew and rust from damaging valuable firearms. 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.