Dry-Packs 1gm Indicating Silica Gel Packet, Pack of 20 Cobalt chloride free orange indicating silica gel Indicator beads change from orange to dark green once it reaches 60-percent of it's moisture absorption capacity Packet made of durable clear perforated plastic which allows it to breath and absorb moisture Fight mold, mildew, corrosion and rust with silica gel Fits all uniden bearcat, radio shack and nascar brand scanners