Check the listing for details. D'Addario Planet Waves PW-HPK-01 Two-way Humidification System. Color: Black, Condition: New. Listed at 27.99 USD. THE GUITAR MAN STORE 1013 SOUTH SALISBURY BLVD SALISBURY MD 21801 open m-sat 10 am to 6 pmD'Addario Planet Waves Two-way Humidification System Guitar Humidifier Kit with 1 Headstock Pouch, 1 Soundhole Pouch, and 3 Humidipak Packets An Effective Humidifier Kit for Your Guitar! The Planet Waves Two-way Humidification System lets you maintain a constant 45% humidity level for your instrument, giving you peace of mind and an easy-to-use system. The system gives you a true "2-way" humidity control, keeping a steady percentage by adding or depleting moisture as necessary. Now you can keep your prized instrument stored without having to resort to messy, refillable units. Protect your investment with the Planet Waves Two-way Humidification System. Planet Waves Two-way Humidification System Instrument Humidifier Features:True two-way humidity control Maintains constant 45% RH within instrument case No water, no drips, no mess Long lasting, maintenance-free design Includes 1 headstock pouch, 1 Soundhole pouch, 3 Humidipak packets Free Shipping in the USA -- USPS with Tracking