Keep your smokes humidor fresh with a Xikar Humidifier! The Xikar Crystal 100 contains a special polymer gel capable of absorbing up to 450 times its weight in fluid! In any climate, the Crystal 100 will release and absorb just enough moisture to maintain a perfect 70% humidity in your humidor. The unique automatic humidity control is achieved by using Xikar's custom mixture of Propylene Glycol Solution. This unit has been packed dry and must be filled before use. For best results, use only Xikar's Propylene Glycol Solution. Re-fill once each month or as necessary. Maintains up to 100 cigars at a perfect 70% humidity for a 'humidor fresh' smoke every time! Complete instructions for filling and using this humidifier are enclosed.