A leash and collar in one! Easy to slip on, and when the dog pulls, the collar becomes snug. Sliding the brass ring towards the collar keeps the collar snug, preventing an escape artist from backing out of it. The lead is made from the [large round braid] cord and the collar is made from the large [flat braid cord]. The three rings are solid brass. Martingale Leads are soft to the touch and come in beautiful color combinations. Please use the contact form if you have special requests or questions.