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3-pack of replacement packets for the D'Addario Two-Way Humidication System (formerly Humidipak), the first maintenance free, two-way humidity control system, made by Boveda, that preserves a constant 45%-50% relative humidity level within your instrument's case. This eliminates all maintenance and guesswork. The system is recommended by taylor guitars and others for maintaining the stability and playability of your instrument.
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