3D printed. This is a part for attaching KATO couplers (close-coupler type) to TOMIX, Greenmax, Micro Ace, etc. TN couplers are expensive! I want realistic coupling faces and distances! This product is recommended for those people. When using, you may need to cut a part of the product, as with the installation of TN couplers. This product includes 100 pieces. For sales of other quantities, please check my other listings or feel free to ask in the question section. For additional orders, it will be +50 yen per piece, but we will offer a discount for customers who purchase in bulk.