30 Pounds of Industry Standard 3-5 mm Large Blue Beaded Indicating Silica Gel Desiccant Our bulk indicating silica gel is the most convenient way to keep moisture at bay. Just keep an eye out for the color change  from blue to pink  and youll know its time to replace the beads with unused ones. Use as little or as much as you need! Bulk silica gel beads absorb 40% of their weight in moisture making them perfect preventing mold, mildew, and corrosion. Protect firearms and ammo, jewelry and clothing, books and documents, photos and more! (Contains trace amounts of cobalt chloride  NOT for use with food or medicine.) Indicating beads are rechargeable! Place in a 200-240?F oven for 2-3 hours, or use the microwave on LOW power for 30 seconds to 2 minutes. NEVER place in oven over 250?F. (Times are estimates  monitor gel while recharging.) Were an American company with all manufacturing and fulfillment handled right here in the US  support, too! All products come with our satisfaction guarantee. If youre unhappy with the product for any reason, contact us for a quick solution or your money back.