Teteron webbing: High quality Teteron printed webbing, for the ideal balance of durability, softness and vivid colors Super HookTM: High quality zinc-alloy hook with patented Zee.Dog screw lock system for total security Signature skull rubber: Trademark rubber skull near the handle and hookExtra Small/Small Size:  Width: 1.5 cm (0.6 in), Length: 120 cm (4 ft). Recommended Breed Types: Poodle, Shih Tzu, Bichon Frise, Boston Terrier, Maltese, Japanese Spitz, etc. Large Size :  Width 2.5 cm (1 in), Length 120 cm (4 ft). Recommended Breed Types : Golden Retriever, Dalmatian, German Shepherd, Labrador Retriever, Chow Chow, English Bulldog, Siberian Husky, etc.