This is a Safety Cutter knife with two dulled blades. I believe one of the blades is a rubber stunt and the other one is just a dulled blade. This is an original prop from the Showtime TV series Dexter. I do not know exactly what episode this was used in though. The crew member said it was definitely screen used, but couldn't remember where.I will also include a certificate of authenticity from my company Reel Relics. I will never write a COA for anything that I'm not a 100% confident on. If you have any questions please feel free to ask. This item is in the category "Entertainment Memorabilia\Television Memorabilia\Props\Originals". The seller is "reel_relics" and is located in this country: US. This item can be shipped to United States.