Silica Gel - 200 Gram Silica Gel Unit. Model: SG200. Unit protects 15 cubic feet area. Drinks up moisture from within enclosed storage spaces, safes, etc. Prevents condensation, stops rust, mildew, corrosion and spoilage. Once saturated, built-in indicator turns from blue to pink signalling need to reactivate unit. Reactivates easily in oven for lifetime protection.