Brass Ironhead Sportster Rocker Box Loop LinesOld Stf Brass case to rocker box oil lines for Harley Davidson Sportster These brass oil lines are functional and beautiful! The relief loop in them not only looks unique, but it also helps the lines flex a bit as the engine grows taller and shorter as it warms and cools. Of course, the attractive yellow metal they're made of brings a little dose of class to most any a scoot! Made in USA.