CIGAR HUMIDIFIERS FOR HUMIDORS. These small round humidifiers are made out of resin and help keep the perfect relative humidity in your cigar humidor. They are gold tone and are replacement humidifiers humidors. They also serve as replacement humidifiers for most humidors and fits smaller round cigar humidifier holes. Each humidifier comes with a 3M stick-on magnet and stick-on metal strip for mounting the cigar humidifier in your humidor. The humidifiers are 2.25 inches in diameter and from front to back are .5 of an inch.