It's a 2 piece aparatus. First you need to stick the hoop on the back side of the drum head and cut it with a razor sharp blade. You can't use scissors or anything like that, you need a blade. Then you place the chrome part from the other side but the stability is just poor. The adhesive on the parts is very poor quality. They come apart after you stick them. The hoop material is good, it also looks good; but you may need to use extra adhesive to add stability. Definitely not worth 13,50€ in my opinion...