Panduit DTKEH-0 Dura-Ty Cable Tie Kit is weather, chemical, and UV-resistant for harsh outdoor power and communications applications. The durable locking mechanism, complete with double stainless steel locking barbs, provides a consistent, reliable connection and high-impact resistance and strength. Extra-Heavy cross section, are made of Weather Resistant Acetal. They are black in color and come in a package with 1 reel of 50' (15,240mm) strapping and 25 heads.