Superdetail older box cars, hoppers and various other equipment with these see-through roofwalks. Styrene parts measure .020′ thick and include .046′ mounting posts. Easily glued in place and painted to match your model. Kit includes two walks, each 35 scale feet long, and four lateral sections. Can be cut and spliced to make a single roofwalk up to 70 scale feet long.WARNING: This product can expose you to chemicals including STYRENE, which is known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov