NEW Spring Stop – Don’t Get Slammed! This ZLP exclusive Spring Stop will provide you with that extra cushion you want to keep away from that tree. Made out of stainless steel, and with our heavy duty recycled plastic ends that are safe with clamps for major durability. The Spring Stop is made for the zip lines 100′ or less with 6% grade or less. The kids (adults too) will love the extra length you get out of your shorter zip line runs, versus the use of a regular bungee braking system. Just feed the cable through the black plastic ends and send down to the end of your zip line. The trolley will bump into the Spring Stop and the spring will compress and slow down the rider. If your zip line is already set-up, it is very important do away with the cable to install this product. 3′ Long 1 1/4″ diameter fits cable up to 1/2″.