It does not fit the smaller sound hole of Harley Benton Kahuna CLU-Bass but you can carefully shave off from around the mute using a craft knife to fit it, without cutting the top lip so it won't fall off. With this, I no longer have feedback issues in high volume environments. Acoustic volume is less as expected, but the output sounds a bit more focused with this installed, which I find is a positive for most acoustic instruments.