This stamping plate is from the forth Bundle Monster set, the first CYO (create your own). It is backed with branded lining to stop it from being sharp, comes covered with a blue cellophane sticker which you have to peel off before use.
On BM421 there are four full nail images and two smaller ones. I think I need to use the police tape one next. All of the images stamped across easily.
You can see all of the designs I have used this plate in here, that is once I have used it!