Dry-Packs Moisture Absorbing Silica Gel Indicating Packets (20-Pack) - Desiccant Drying Agent Moisture Absorbing Indicating Dry-Packs protect against mildew, corrosion, and fogging. The Dry-Packs are packaged in an air tight aluminum Moisture Barrier bag and come heat sealed from manufacture. The bags are also resealable with a built in zipper in the Moisture Barrier bag. Package contains 20 of the Indicating Silica Gel Dry-Packs, measuring about 7/8" by 1 1/2" per packet and weighs 1 gram each packet. These are ideal size for camera housings, electronic bags, shoe boxes, coin collections, tackle boxes, backpacks, tool chest, etc. Dry-Packs Indicating Silica Gel Packets DO NOT contain Cobalt Chloride (II). Cobalt Chloride (II) is Silica Gel that comes in a "Blue" color and this "blue" Silica Gel has been linked as being possibly carcinogenic to humans and been labeled as hazardous material in some countries. Dry-Packs Silica Gel is reformulated to eliminate Cobalt Chloride (II). Dry-Packs contains Silica Gel (Desiccant) with Indicating beads that turn from Orange to Dark Green when the Silica Gel is about 60% absorbed with moisture.