Nylon is the strongest synthetic material used for DIY ropes. Smooth braid has a lock-stitch construction which results in a firm, round rope. Smooth Braid will keep its round shape under load and works very well in blocks and pulleys. Nylon has a "memory" for returning to its original length, making it best for absorbing shock loads. It's the best option for hauling, lifting and towing. Nylon will last four to five times longer than natural fibers because it has good abrasion resistance, good UV resistance, and it is not damaged by oil or most chemicals. Do not use for overhead lifting. Never exceed the Safe Working Load (SWL).