THE GOLD STANDARD - Measuring Approximately 2.875" X 6.125" X .5"; You'll Love the Goldish FinishThe Gold Standard Measuring approximately 2.875" x 6.125" x 0.5", you'll love the goldish finish that adds a touch of elegance to your humidor.Best Value Our small/medium/large humidor humidifier fits up to 250 cigars and offers the best value on Amazon without sacrificing quality.Best Use For optimal results, use propylene glycol humidor solution (preferably our Humidor Solution) to maintain a relative humidity (RH) of 70%. Alternatively, distilled water can be used (not tap water), but it requires refilling every 2-3 months or more if opened daily.Easy to Install Includes two (2) 3M double-sided tape strips for easy mounting of the humidifier directly to the inside lid or side of your humidor.