When used for the intended purpose, it works well.

I am the proud new owner of a Martin OM-42 guitar, and I discovered after a short while, that all the sound hole covers to purchase in Denmark was to big for the sound hole in the guitar

On the other hand I was glad to find out, that I could use the adjustable lid to get to the small volume-wheel from the L.R.Baggs pickup inside the soundhole

So I tried to buy one and cut slices of the rubber - didn't work

I was dissapointed with the quality of the material - cheap and quite hard plastic, and especially the 4 "legs" to fit inside the sound hole has small plastic leftover pieces from the casting, that eventually will make scratches on the guitar

I was dissapointed with the quality of the material - cheap and quite hard plastic, and especially the 4 "legs" to fit inside the sound hole has small plastic leftover pieces from the casting, that eventually will make scratches on the guitar

The unit is thin, hard plastic.