This is the High Stress Rod 36 by Sullivan. The Gold-N-Rods are lightweight and strong. The spline design defeats binding and friction, and the non-metal construction prevents radio interference. These are very easy to install and easy to adjust, and they also apply temperature compensated materials to minimize thermal expansion. These are for large models or high strength applications. They use 4-40 hardware and are for uses where turns are slight or the length is over 48. The test strength is 80 lbs. The overall length is 36.