The BT6LH-L0 Dome-Top® barb ty, features a unique patented design with its round smooth edges. Paired with the stainless-steel locking barb, these cable ties provide consistent performance, reliability and infinite adjustability through the entire bundle range. Light-Heavy cross section, 21.2. (538mm) length. Appropriate for Indoor/Outdoor use, made of Weather Resistant Nylon 6.6 with high resistance to ultraviolet light, are black in color and come in packages of 50.