3 Pack, 21", Black, Cable Tie, Releaseable - Reuseable, Nylon, Ultra Violet Resistant, Temporarily Fastens Wires, Cables & Hoses, Extended Releasable Tab In The Head Makes For Easy Release & Reusability, For Temporary Work Or Where Frequent Servicing Is Required, Ultraviolet Black Ties Resist Harmful Light Rays, Primarily For Outdoor Use.