This weatherstrip channel (often called window run channel or window channel felt) runs inside the top and back of the door frame on your classic truck. This weatherstrip reduces drafts, wind noise, window rattle, and allows the roll-up side windows to operate more smoothly. Includes two window run channels with enough material for the two front doors on the truck. The window run channel is often replaced along with the division run channel, and windowfelt (both available separately).