D'Addario Humidipak Control System PW-HPK-01 hosa 80/20 strings are known for

80/20 strings are known for their bold

light tension feel

and touring professionals who demand speed

The slim-taper

timeless appearance with polyurethane gloss

D'Addario Humidipak Control System PW-HPK-01 hosa 80/20 strings are known forThe D'Addario humidipak control system uses patented gel technology to release water moisture when your guitar needs it. Its automatic and easy! This system is best used when storing your guitar in the case. Place two gel packs in the soundhole pouch and one gel pack in the headstock pouch. That's it! Depending on the ambient humidity in your area, these packs can last between 1 3 months.