The N172D is a Double layer nylon leash that is built out of 3000-pound test nylon. The double layer leash comes with a stainless-steel bolt snap which makes this leash all together the strongest on the market to date. Available in Black.
The N172 is a single layer nylon leash that is built out of 3000-pound test nylon which comes in Black or Coyote. The black comes with a stainless- steel bolt snap and the coyote comes with a solid brass bolt snap.