The Herm Sprenger 2mm short link chrome plated steel choke chain collar is the preferred choke collar for training. The high quality German machining and short link allow this collar to slip easily so that a correction can be quick and then released, making it an effective training tool. The 2mm is considered light weight. We have only a limited quantity of these.
These collars are available only in an 18" length. When ordering a collar, choose one that is at least 3-4 inches longer than your dog's true neck size. So, if your dog's neck is 15 inches around, order an 18 inch collar. You can also measure around the dogs head at the largest point and add 2". The chain is measured from the end of the ring to the end of the ring, not the length of the actual chain.