Precisely control humidity and maintain the best humidity for cigars in your wood humidor to protect the essential oils and sugars of premium cigars. No more mess of using sponges, gels or beads. 72% RH is for: Wood humidors, glass-topped humidors, drafty humidors and non-plastic travel humidors and cigar cases Storing cigars with fragile wrappers, including Cameroon and Connecticut Shade wrappers Up to 1 lb of aromatic pipe tobacco A Single Size 60 is for: Up to a 25-count humidor (For larger humidors, use one Size 60 for every 25 cigars your humidor can hold.)