3/8" All Weather Biothane LeashMade from 3 8" BioThane Beta 520 1 2" solid brass or stainless bolt snap Available in 4 choice of 4 colors All lengths include o ring in handle Completely waterproof [split] The Redline K 9 Sport All Weather Biothane Leash is constructed from heavy duty 3 8" BioThane Beta 520. Biothane is a vulcanized rubber material that does not retain moisture or rot and has a break strength of 1000 pounds per inch of width. All sizes are finished with our heavy