This is the 12´ 6" long elastic shock cord (or bungee cord) that recoils the chain on recovery. If your chain recoils slowly—or not at all—between strokes, then you should inspect your existing shock cord. See more info. If you're rowing outdoors and your chain comes off, you'll need to be able to quickly and easily reattach it. That's where our elastic shock cord comes in handy. It's designed to recoil the chain quickly and easily, so you can get back to rowing without any delay. Our shock cord is made from high-quality materials, so it's durable and long-lasting. It's also easy to install, so you can get started using it right away. Whether you're a beginner or an experienced rower, our elastic shock cord is a must-have accessory for your indoor rowing machine.