JFM-0507-05 is a product from Igus, a manufacturer of high-performance polymer bearings, linear guidance systems, continuous-flex cables, and cable-management solutions. It is a 50 mm stroke ball bushing, also known as a linear bearing, which is a type of bearing used to provide low friction motion in one direction. It is made up of a steel cage that contains steel balls which roll along a hardened steel shaft. The ball bushing is self-aligning and dust-resistant, and can easily handle heavy loads without experiencing any premature wear.