Description from Amazon FRANCE : Humidifier for guitars and basses with small bodies, such as classical guitar, acoustic guitar, or acoustic basses in the shape of an acoustic guitar Is inserted into the sound hole of the instrument Protects instrument from damages due to dryness Includes a humidity level indicator (damp - humid - normal - dry) Includes a cover to seal the sound hole during use. Made of soft latex which is harmless to all instrument finishes, these humidifiers release moisture to maintain proper humidity levels. Easy-to-follow instructions and a user-friendly humidity gauge are included. It is essential to maintain a proper moisture level if your instrument is stored in an area prone to severe dryness and/or cold (such as a heated home). The Grover humidifier helps to prevent adverse effects such as bad string action, buzzing, protruding fret ends, cracking, top-sinking, and other damage caused as a result of dryness.
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