This product was recommended to me from a friend and I think it's pretty awesome for what it is. It hangs on just about any door that has a door knob to keep the door from opening. Being a 140 lb guy, I could muscle all four ropes pretty easily, but that's not what it's designed for. These are resistance training ropes and muscling them would reduce their life span greatly. I would highly recommend these for people who want to improve their endurance or those who want to keep their muscles toned and don't have the time and space for a complete gym set or gym membership. The set comes with two handles and two ankle straps, so you can work out just about any muscle in your body except your neck (unless you grimace when you work out). The door latches are made of metal, but the rope latches and pulleys are all plastic. I lost a lot of trust when I realized the rope latches and entire pulley system (except bolts) were completely plastic! But needless to say, they have lasted through my abuse. Also, the ropes seem to have lost tension since I started using them two weeks before.