TRAINING LINES: These trainers and super cords are the professional's choice for training to come on command and retrieving to hand. "Super" training cord for dogs is designed not to pick up burs. MATERIAL: These check cords are constructed of the same multi-filament polypropylene roping used in all of Mendota’s products. These long lines are UV coated to protect against decay and fading, and are gentle on the hands. PROFESSIONAL CHOICE: Professionals choice for training to come on command. SIZING: Available in multiple length and widths - Obedience 3/8 in x 20 ft, Trainer 3/8 in x 30 ft, Trainer 3/8 in x 50 ft, Pro Trainer 1/2 in x 30 ft, Suprt Cord 7/16 in x 30 ft or 50 ft MENDOTA GUARANTEE: Mendota's gear for dogs is built to last, we guarantee it for the life of your pet.