Viper Biothane Working Tracking Lead Leash Long Line for Dogs 2 Colors and 12 Sizes Created from a high quality Biothane waterproof coated webbing Features top grade solid brass hardware. Made in the USA. Available in Black or orange as well as in 10', 15', 20' or 33' lengths. Available in 1/2", 5/8", and 3/4" widths.