This is a 21cm cake pan. The bottom does not come out. It can be used for cheesecakes baked in a water bath. You can bake delicious cakes using parchment paper. My family has gotten smaller, and I bought this pan too big, so I've been using the 18cm one more often, and I'm selling this one. I've used it once or twice. I didn't scrub it too hard because it might get scratched, but I washed it normally. I will ship it as is. Please refrain from purchasing if you are overly concerned about minor details. I think the quality is good because I bought it at a specialty confectionery store. Thank you.