The Luca Leash offers the ability for the handler to give a controlled quick and gentle correction that eases when the pressure is released. It is a fantastic leash for teaching your dog to walk comfortably beside you and great for teaching new tricks. Please be aware, no slip collar or leash should be left on a dog that is tied up or unsupervised. This Luca Leash has been designed for both Large and Small dogs in mind. The leash includes high quality extra strength climbing rope and unique polished metal hardware and is available in both "Standard" (170cm length and 9mm thick) and "LITE" sizes (170cm length and 6mm thick).