Safeguard your instrument. Shar Music® created the Humidi-Guard™ to be easy-to-use, inexpensive, and effective. Changes in humidity can wreck your instrument. Solve the problem with ease: soak the Humidi-Guard in water and slip the flexible tube through the F-hole of your violin or viola. Done and done!

(And a note for fractional violin and viola owners: the Humidi-Guard may not fit through the F-hole of some smaller instruments – the tube is 7 mm at its widest point; if you own a smaller instrument, you may want to measure the F-hole before you buy.)