This rectangular humidifier is a great accessory for medium to large sized humidors .  It's filled with absorbant polymer crystals designed to help maintain humidity at 70%.  Fill it with distilled water and the crystals will expand.  When they  shrink to about half their size it's time to refill!

• Transluscent Casing to Help Monitor Crystals
• Stainless Steel Screen
• Filled with Gel Water Crystals
• Metal, Tape & Magnet Providing Easy Attachment to your Humidor

Dimensions (Outside): 6 5/8"W x 2 1/2"H x 3/4"TH