Premier ECO Dog Collar -made of 100% recycled Plastic Milk Cartons Better than a buckle, safer than a choke. Used with a leash or with your hand, the martingale-style Premier Collar tightens to give greater control and reduces the risk of a dog backing out and escaping. Durable Brushed nickel hardware Wonderful for use in training classes, on walks or around the home. Martingale-style collar made of 100% recycled plastic milk cartons Better than a buckle, safer than a choke; Used with a leash or just your hand, the martingale-style collar tightens to give greater control and reduces the risk of a dog pulling out of its collar and escaping; Wonderful for use in training classes, on wal For medium size breeds such as Dalmatians and Spaniels 25-60 pounds Durable Brushed nickel hardware Wonderful for use in training classes, on walks or around the home.