It is a good rubber gum stopper. even has a '9' in a triangle, underlined, as to quickly be able to identify it in my bag o stoppers (i have lots of sizes for various purposes)

My wife needed a solid stopper for a salad dressing container, but had no idea where to find one. I told her More Beer probably has one. They did, which is why you are seeing this review. It's works great if you are looking for solid stopper or for a stopper with more holes than are currently available. If you need extra holes, you can put the stopper in the freezer to harden it and use a drill to make extra holes.