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. Product Features Absorbs moisture from the air Easily recharged in oven Breathable bag provides protection for up to 33 cubic feet Product Specifications 450 grams Bag dimensions: 8" W x 5.5" H x 1.5" D