D'Addario Accessories Sponge Pro Replacement Pack

These do exactly what they are supposed to. They keep my guitar interior humid. I recommend and would buy again.

Don’t get sucked into the ones that are actually super porous and brown These are the ones you want. I use them in the hangers and on tinfoil in the guitar body itself

Can confirm that these barely fit in the conventional sponge D'Addario humidifiers, but a little bit of trimming makes them fit better. These are definitely an improvement over the conventional sponge. If I soak them well, I can get an extra handful of days out of them. Happy with them so far after 2 months of use!

They work as well as the older and larger sponges, but you have to be careful, because they dry out faster--much faster

Does what the ads promise.

The listing very clearly states: "Item Dimensions LxWxH 4.25 x 1 x 4.75 inches."That would have met my needs. The actual item is 1.5 x 3/8 x 2.5 inches, not even close.To re-state: I received two sponges. Each one is 2.5 inches long, 1.5 inches tall and 3/8th in width.Even including the packaging it's smaller than the product information states for the "item."

I really like how they hold their moisture but one of the sponges was hard as a rock. I did work it for about 5 minutes under water but the next time I went to change it it was hard again. I can’t say much about why because I have never used these. I would have given 5 stars but for obvious reason I couldn’t.

Sponges work well, but sure are expensive.