This is a recycled nylon climbing rope that has been upcycled. Upcylcled is when a product goes from its original form and thenis transformed  into something else while extending the life of the rope. This is a great dog leash with no carbon-intensive recycling process.  There is a tubing that protects the hand-sewn knot from weather,wear and tear.  There is a swivel snap for easy connection to leash.  There is a 2' heeler( This keeps your dog closes in busy places such as parking lots and vet offices.) The 4' big dog leash and a 6'big dog leash.  Great for walks and runs. The rope width is 10-10.5 mm range and the colors vary depending what climbing ropes are recycled.  This is a long lasting one of a kind leash that you and your dog will love.  This leash stays out of the landfill and gives the environment a break.