The DryMistat cigar humidor tube works with and fits easily into any cigar humidor or any well sealed storage container. This patented made in the USA, 2-way humidity control system automatically maintains 70% RH (relative humidity). This keeps cigars humidified in their perfect storage and aging environment to preserve the Master Blender’s intended flavor and taste for your enjoyment. The crystal filled DryMistat humidor tubes unique space age, no leak design allow humidity to escape through micro pores while holding the propylene glycol solution inside. Over time the crystals will shrink slowly as the water evaporates. To recharge, simply refill with Plain or Distilled water when it reaches the “time to add water” refill line, so no guessing. Each DryMistat crystal humidification tube comes fully charged and ready for immediate use to regulate humidity for up to 25 cigars. Buy your DryMistat today, a brand you can trust with a 1 Year Warranty. Serving cigar enthusiast for years with over 2 million sold!