Dry-Packs 112gm 4-Pack Silica Gel Desiccant Packet, 5 by 3.25-Inch. Product comes ready to use; Just open outer package and use Each Packet Dimension is 5" x 3.25" - Protects Up To 8 CU FT Per Packet (4 Packets Per Order) Uses include Boats, RV's, Tents, Storage, Garages, Tool Boxes, Tackle Boxes, Electronics, Cabinets, Closets, Ammo Cans, Safes, etc. Packaged in Tyvek which is strong and tear resistant Protect your valuables from moisture problems including Mildew, Mold and Corrosion