Ordered this for my new Taylor GS Mini guitar I got for Christmas. The product is a simple yet functional design, a sponge inside a rubber tube with holes. If you have a guitar you want to last and live in a cold part of the country its crucial to use something like this. Ideal humidity for a guitar is about 47% and in my house during the winter its only around 30%, so I re-wet this about every 5 days. WARNING: It comes with no instructions, but taylor has some great instructions on their website. Big thing to realize is you have to run this under cold water, then squeeze out every last drop and dry the oustide before placing in the guitar. Then should be wedged in between the B and G strings, and allowed to hang in the body. If you don't squeeze out the sponge then it can drip and ruin the guitar. Also recommend buying a cheap digital humidifier to place in your guitar case so you know how often to re-wet the sponge. Highly recommend the product.