The Humi-Care Black Ice Humidification jar is a one-of-a-kind humidification system! These Black Ice 'Pie Jars' separate into 4 equal-sized pieces to allow for a more even humidity distribution and take up less space by fitting into the corners of your humidor. The new Black Ice Crystals allow for a slower, steadier release of moisture to ensure the stability of humidity in your humidor. Choose the 4oz jar for your everyday sized humidor, or the 8oz jar for larger 150 to 300-capacity humidors. Please Note: Crystals are shipped dry/not activated to allow you the flexibility to use only a fraction of the jar if desired. The dry crystals are very small but will fill the container when activated. To activate, simply fill each section with distilled water or cigar juice about halfway then wait approximately 30 minutes until the crystals absorb all of the liquid.