These are repair parts born from consultations! Do you have any vehicles where the part that attaches the coupler has broken? This is a replacement part for that. We've received reports from those who have purchased this that they were able to successfully repair their vehicles at home! Why not revive the vehicle couplings you'd given up on? The red part in the last photo is the product! The example photos show black parts, but only red ones are available. Please note. We have designed two types of repair parts shown in the photos, so they are compatible. We will provide both types, so if you're unsure which one you need, you can try them out with peace of mind ٩(ˊᗜˋ*)و We offer a set of A and B for 450 yen! Type A Can be used for chassis of commuter trains, limited express trains, etc. The following are the compatible dimensions: ・Boss diameter in the photo is approximately φ8mm ・Inner dimension of the chassis is approximately 13mm Type B Shinkansen (bullet trains) and some leading cars The following are the compatible dimensions: ・Boss diameter in the photo is approximately φ8mm ・Inner dimension of the chassis is approximately 14.5mm Even if it's not listed above, you can generally use Type A with some modification. Please consult with us. Type B is actually running in my home. You will need to cut some of the ribs inside the car body, so please refer to the photos m(_ _)m You can easily cut them with a carving knife (flat blade) etc. Using nippers may cause cracks in the vehicle, so a carving knife is recommended. Some vehicles may require modification. Recommended only for those who are good at carving and modifying things themselves ☺︎ For bulk purchases, the price is +100 yen for each additional item. Feel free to comment, and we'll be happy to answer your questions ^_^