The special leak-resistant lining of the Boveda Fabric Holder lets Boveda’s pure water vapor achieve and maintain a constant relative humidity (RH) range of 45% to 55%—the safe zone for wood instruments. Simply Place the Boveda Size 70 into the holder and place it in your instrument case, it's that easy. Individual product dimensions:Single (1-pouch) holder: 6" x 4.25"Double (2-pouch) holder: 12.5" x 4.25" (unfolded); 6.625" x 4.25" (folded) Use with all Boveda, including High-Absorbency Boveda for wooden instruments in high-humidity climates (replacement Boveda available separately). Always insert Boveda into a sleeve of a Boveda fabric holder before placing Boveda into an instrument case. Leak-resistant holder lets pure water vapor in and out while providing an extra measure of protection from a sharp string or unfortunate impact. Soft, like a polishing cloth, so the polyester exterior is safe to store with an instrument. CHOOSE THE RIGHT HOLDER FOR YOUR INSTRUMENT: 1 Standard Holder (for electric guitars and basses; small stringed, fretted and wood woodwind instruments; and small cases) which can hold 1 or 2 49% RH Boveda Size 70 2 Double Holders (for acoustic guitars; large stringed, fretted and wood woodwind instruments; and large cases), which can each hold up to 4 49% RH Boveda Size 70 Always insert Boveda into a pouch of a Boveda fabric holder before placing in an instrument case. Do not mix different Boveda RH levels within the same instrument case. And do not use Boveda in the same case with other humidification products because they will fight against each other and reduce the efficiency of Boveda.
