This is the zipline of my zipline install. 250 ft of this is very heavy, and ~120 ft that is the length of my zipline was much heavier than I thought, but that is probably due to me being on a ladder at the time. If I'm doing this again, I'd attach the higher end first, and then attach the lower end while standing on a firm ground. I think it's breaking point is 1500 lbs, which is actually the lowest rating of all the other parts of my zipline.  Still, it should handle a kid weighing 50 lbs easily. Can't overbuild enough.