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