Why isn’t a Size 8 Boveda working with my guitar?
Too small. For guitars, use B49 Standard Refills. Boveda Size 8 packets don't contain enough formula to properly maintain humidity levels in larger instrument cases. Those smaller Boveda fit a bow tube or tight-fitting instrument case for an oboe or clarinet.
WHICH BOVEDA DO YOU NEED FOR A GUITAR?
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Start with a Large Starter Kit.
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Refill with Boveda B49 Standard or B49HA*.
* B49HA is a specialty solution for climates with year-round extreme humidity exceeding 60% RH.