Boveda Music Small Starter Kit - (1) 49% RH Standard Boveda - Ideale twee-weg vochtigheidscontrole voor de meeste klimaten - voor ukelele, viool, klarinet en andere kleine houten instrumenten

I use these with my mandolin and they work perfectly. I place one under the headstock and keep one on the top between the bridge and tail piece. The packs last about four months (here in North Central Texas) year round, but I usually change them per the manufacturer's recommendation. They offer great protection for a modest price. I enjoy the hassle-free approach - no water or sponges to care for!

This winter is colder than usual here and my violin has had to deal with temperature and humidity variations. I bought this after arriving at my orchestra rehearsal to find my bow under tension and my e string peg slipped. No mishap since purchasing. It did force me to keep my violin in its case rather than on the stand in order to enjoy the benefits — but having my violin stay in tune session to session is pretty amazing. All my violin and guitar cases now have one!

The best for wooden instruments—worry free and works.

I use these packets for my ukeleles and other small wooden instruments. They control the humidity so the wood doesn't buckle or crack. I doesn't add humidity (like a humidifier), rather it moderates the level of the humidity available to keep it stable in most climates. I use the ones made for a steady 49% humidity and I'm very pleased so far.

They last longer than it states on the package. Easy to use, and helps balance humidity while the instrument is in it's case. I wish I could find refills instead of having to buy holder as well.