EXMAX Blue Indicating Rechargeable Silica Gel Beads(2-4mm) Desiccant Functional Reusable Hard Plastic Canister Humidity Moisture Absorb BoxDryer for Camera Microscopes Telescopes - 4 Pack Premium Quality: Blue silica gel desiccant is compact, rugged, easy to carry and store.Premium Quality Silica Gel Desiccant Beads.Net weight for each pack is about 45g=1.59oz,Beads size 2-4mm. Indicating: Beads will turn from Blue(Active) to Red(Saturated) after absorbing 50-60% moisture.Still almost half more capacity left to absorb moisture even after color change. It turns to Red color.You can reuse your used silica gel with Microwave. Heat in microwave just 5 minutes (Medium / low power), Color will slowly change back to Blue after reactivation.Depending on beads' condition, they may take shorter than the recommended time. Please check the beads' color periodically. Safe: Air Tight Sealing for Long Term Protection & Preservation.Pack Dimension : 0.98*2.16*2.16in/25*55*55mm " , Silica Gel Beads Size : about 2 ~ 4 mm. Pack Weight:45g=1.59oz. Rechargeable:Silica gel is non-friable and won't disintegratePackets are Stored in Resealable High Quality Self-Standing Plastic Case for easy storage and use.When Blue beads turn to Red you can reactivate easily in oven or microwave.Beads can be Reactivated in the Oven for half to two hours at 200-250F Or Microwave for About 10 Minutes at DEFROST. Useful:The Indicating Silica Gel Beads(2-4mm) Desiccant are great for camping gear, fishing gear, cameras and photographic accessories, lens storage,Tool boxes, safes, gun cabinets, laptop bags, closets, storage bins, shoes, boats ,Guns, Ammo, Canister, Collectible, Jewelry, Passport, Cosmetics, Books, Documents, Travel Bags, Gym Bags, Make Up Boxes, Silverware, Christmas Decorations, & Valuables, households etc.