These are a fashionable but rugged heavy duty shoe or bootlace. Hand fabricated with silver steel tips crimped in 4 places! 100% polyester shoelaces with an outer sleeve braided over a rugged wear strong inner core. The laces are machine washable and will not fade or shrink. The polyester is water resistant, resistant to mildew, and will always remain tied until you decide it is time to untie them!