Exercise your dog while riding your bike. This attachment fits around the stem, under your seat. The clamp has a quick release connection so that the clamp does not have to be removed once attached. It allows for your dog to walk comfortably next to you while you are riding. It currently sells at amazon for $128. It is made of high carbon steel, military grad paracord and has the strength of 550 lbs. the length of the leash can be extended by removing 2 springs inside the tube. This is a quality product with years of use. It is basically in new condition.