I have a wooden, handmade kazoo 3/4" thick. The kazoo holder fits tight, but well! And the kazoo you sent me and the Sondery I have fit without effort, although because of the size of the wooden one, they will not fit (and stay) at the same time the wooden one is loaded. But that is my folly with my kazoos and not the fault of the holder which was designed quite well. Very happy.