This is a pair of N scale trucks for my Union Pacific's Water Tender kits.
If printed in FUD & FXD materials 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.
The trucks require 6 no. MT wheels, which are not included.
For more information please see my blog - www.jamestrainparts.wordpress.com