Flyvines Recycled Fly Line Key Chains Though technically not a “chain” this key chain made from recycled fly line is the perfect size for making sure your keys are easy to grab out of any pocket or purse. We offer two sizes of key chains, one is a shorter lanyard version, which is roughly 10in, and fits perfectly over your wrist.  The other option is roughly 3in long, and fits perfect in a pocket.