Piping for mounting ceiling trim GAZ-M21 . It is a colored ribbon, folded and sewn in a special way on the model of the original. The headliner of the car is fixed with tacks
https://en.avtoclassika.com/car/m20/2144/47028/?_ga=2.10086645.1723911827.1554970480-1124452845.1536916424
through this edging, which, after installation, is designed to hide attachment points.
Price per set 4m.
Cost depends on material and color. Perhaps the execution of different colors on order.