WB550HD | CRESCENT HEAVY DUTY CABLE TIES 550X9.0MM 25 PACK 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.Features/Benefits High quality nylon 66 UL approved, Carbon additives for UV protection, Extra strength due to increased material thickness