When we started Control Line Parts, we wanted to bring together manufacturers that create innovative CL components and make them available to pilots in an easy, fast way. This is why we are on Amazon. We looked at the most basic component of CL models and looked for ways to improve it. Our first product: control lines! We found lines with lowest amount of stretch and higher pull rating than a typical control line. We improved the storage reel to provide a way to hold line ends without bending them while in storage. We don’t rely on line pull rating declared by manufacturers based on tests done on a prototype 30-40 years ago. Every set of lines we sell is pull tested by us to ensure the lines comply with the required ratings. So why do you need lines of various lengths!? Proper line length is an essential part of trimming your model. Yes, model trim is not just about CG, tip weight or lead-out position! It is just as important that you have proper line length. Too long and controls will feel mushy or the model will float in overhead maneuvers. Too short and you will have too much line tension or too little time to react. This is why we created a kit to give ultimate flexibility in line lengths. While you are free to create line ends using any method you like, we strongly recommend that you use methods defined by the AMA and FAI rules only.