This is an N scale set of four EMD DD35 body mounted pilots to replace the original truck mounted ones. They are designed to be used with a James' Train Parts EMD DD35 locomotive kits.
They have a socket to receive a Micro-Trains body mounted coupler. (1015 or 1016)
These parts are designed to be printed the FUD & FXD materials and they will require cleaning before painting. I recommend washing with warm soapy water then soaking in 'Goo Gone' or similar product for about 24 hours. Then rinsing off with warm water and allowing to dry.
For more information please see my blog - www.jamestrainparts.wordpress.com