Crescent Cable Ties are high quality, self-locking nylon cable ties that come packaged in a handy, resealable zip lock bag which enhances the life expectancy of the ties. The black cable ties are UV resistant, which prolongs useful life under sunshine/outdoor applications. Available in a range of sizes, these nylon UL approved cable ties are resistant to most chemical acids and are ideal for use in the home, office or workshop. - Black premium cable ties are UV resistant (takes the high-energy UV rays and converts them into heat before they can damage the polymer resin), prolonging life in indoor and outdoor applications - One piece construction, self locking virgin nylon 66 cable ties. Extra strength due to heavier weight of material used - The handy zip lock resealable pack enhances the cablet tie life expectancy - The nylon 66 UL approved cable ties are resistant to most chemical acids