3D-printed. This is a part for attaching KATO couplers (close-coupled type) to TOMIX, Greenmax, Micro Ace, etc. models. TN couplers are expensive! You want realistic coupling faces and spacing! This product is recommended for those people. When using this product, you may need to cut a part of the product, similar to when installing TN couplers. This product includes 400 pieces. This product may take about a week to ship. For sales of other quantities, please check other listings or feel free to inquire in the question section. Requires KATO product 11-731 separately and requires assembly. Depending on the track environment (sharp curves, layouts with gradients, etc.), you may need to use 11-730. We also sell pre-assembled products with all couplers attached, so if you find the processing troublesome or are not good at it, please purchase those. For additional orders, it will be +50 yen per piece, but we will offer a discount for customers who purchase in large quantities.