HYDROSORBENT 450 Gram Silica Gel 33 Cubic SG-450 Helps to keep moisture away from your valuables. Can adsorb 15 percent of its weight in water vapor in 2 hours. Reduces condensation and remains dry even during humid, damp conditions. Prevents rust, mildew, corrosion and spoilage before they begin. The 450 gram carton measures 4 1/2" x 2" x 7". Covers an area of 33 CU. FT. of enclosed space.