After much research and many trials, the best rope for the wood tree swings is Poly-Supreme Rope.This rope is strong and light weight( breaking strength is 3,780 lbs) This is a twisted 5/8 inch rope, we will be using this rope on all of our swings real soon right know it is used on the Premier Swing.We had to have something that would hold a splice well. The color is solid Tan. This rope is made with a special 100% polpropylene film yarn that will never get rough or splintery-like,Instead, thee more it is used the softer it is on your hands,and it even holds a knot better.It's treated with UV which protect it from breakdown from the sun and it is 100% waterproof. It is sold for $1.25 per foot. You can purchase a swing and get as much rope as you need .