The D'Addario Guitar Humidifier System Includes The Humidipak Maintenance Kit, Product Details Product Description The D'Addario Humidifier Is The Only Maintenance Free, Two-Way Humidity Control System For Guitar. It Automatically Maintains The Optimal 45-50% Relative Humidity Level Within Your Instrument Case, Eliminating The Guesswork And Potential Mess Related To Refilling A Humidifier. Unlike Refillable Humidifiers, The Humidity System Provides True ?Two-Way? Purified Humidity Control By Adding And Removing Moisture On Demand. No More Manual Adjustments Based On Seasonal Changes, Geographic Locations, Temperature, Or Other Factors. The Humidity Kit Comes With 3 Humidifier And A Soft Mesh Pouch That Will Not Harm Your Instrument'S Finish. Humidipaks Last Between 2 And 6 Months And Should Always Be Kept In A Sealed Environment Like A Hard-Shell Case. Once The Humidifier Become Firm, Discard And Replace Using The 3 Refills That Come In The Humidity Replacement Pack (Pw-Hprp-03). D'Addario Is Known For Innovative, Problem-Solving, Quality Musical Accessories, Offering A Complete Line Of Award-Winning Accessories Including Cables, Picks, Tuners, Capos, Straps, Humidifiers, Maintenance Tools And More. The Planet Waves Humidipak Is The Only Maintenance Free, Two-Way Humidity Control System For Guitar. It Automatically Maintains The Optimal 45-50% Relative Humidity Level Within Your Instrument Case, Eliminating The Guesswork And Potential Mess Related To Refilling A Humidifier. Unlike Refillable Humidifiers, The Humidipak System Provides True Two-Way Purified Humidity Control By Adding And Removing Moisture On Demand. No More Manual Adjustments Based On Seasonal Changes, Geographic Locations, Temperature, Or Other Factors. The Humidipak Kit Comes With 3 Humidipaks And A Soft Mesh Pouch That Will Not Harm Your Instrument'S Finish. Humidipaks Last Between 2 And 6 Months And Should Always Be Kept In A Sealed Environment Like A Hard-Shell Case. Once The Humidipaks Become Firm, Discard And Replace Using The 3 Refills That Come In The Planet Waves Humidipak Replacement Pack (Pw-Hprp-03). Planet Waves, Part Of The D'Addario Family Of Brands, Is Known For Innovative, Problem-Solving, Quality Musical Accessories. Planet Waves Offers A Complete Line Of Award-Winning Accessories Including Cables, Picks, Tuners, Capos, Straps, Humidifiers, Maintenance Tools And More. From the Manufacturer The Planet Waves Humidipak is the only maintenance free, two-way humidity control system for guitar. It automatically maintains the optimal 45-50% relative humidity level within your instrument case, eliminating the guesswork and potential mess related to refilling a humidifier. Unlike refillable humidifiers, the Humidipak system provides true ?two-way? purified humidity control by adding and removing moisture on demand. No more manual adjustments based on seasonal changes, geographic locations, temperature, or other factors. The Humidipak Kit comes with 3 Humidipaks and a soft mesh pouch that will not harm your instrument's finish. Humidipaks last between 2 and 6 months and should always be kept in a sealed environment like a hard-shell case. Once the Humidipaks become firm, discard and replace using the 3 refills that come in the Planet Waves Humidipak Replacement Pack (PW-HPRP-03). Planet Waves, part of the D'Addario family of brands, is known for innovative, problem-solving, quality musical accessories. Planet Waves offers a complete line of award-winning accessories including cables, picks, tuners, capos, straps, humidifiers, maintenance tools and more. Humidification System: D'Addario Humidipak Is The Only Maintenance-Free, Two-Way Humidity Control System For Guitar. Includes Pouches And Guitar Humidifier Packs Protect Your Guitar: Protects Your Instrument Against Warping, Cracks And Other Damage Cause By Lack Of Humidification Two Way Humidity Control: The First Two-Way Humidity Control That Maintains A Constant 45%-50% Relative Humidity Level Within Your Instruments Case Automatic Humidifier: It Automatically Maintains The Optimal 45%-50% Relative Humidity Level Within Your Instrument Case, Eliminating The Guesswork And Potential Mess Related To Refilling A Humidifier Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.