These are custom made, 3D printed game pieces to match the ones that go to the Mousetrap game. According to the Mousetrap game instructions, "the first player to collect six cheese wedges and make a complete cheese wheel wins." The cheese tray is helpful to have because you don't have to ask which color someone is when trying to pick which victim goes in the trap. This sale is for replacement pieces only, they are not the originals or made by Hasbro. There are 29 pieces in one bag, quantity shows 1 for the bag. Choke Hazard: do not let toddlers chew on these pieces because they could choke. Ruler not included. Feel free to ask questions. I do offer returns within 30 days if you are not satisfied. This item is from a smoke free/pet free home. If you have any concerns upon arrival, please contact me before leaving feedback so that I can take care of the problem first. Thank you for reading my ad and have a great day!