Search Guitars & Wood Instruments FAQs FAQs / Guitars & Wood Instruments Which Boveda do I use in which Boveda Holder? B49 Standard + B49HA High Absorbency Refills Single Holder Double Holder Directional Holder B49 Size 8 Refills Mini Holder Related Topics Why use Boveda to protect my instrument? How does Boveda protect wooden instruments? How do I use Boveda in my instrument case? Which Boveda Starter Kit is right for my instrument? What is the difference between B49 and B49HA?