The BT1.5I-C is a natural barb ty Cable Tie made of nylon 6.6 (polyamide 6.6). The Dome-Top? cable tie features stainless steel locking barb provides consistent performance, reliability and infinite adjustability through entire bundle range. Dome-top head features unique patented design with round and smooth edges. Curved tip is easy to pick up from flat surfaces and allows faster initial threading to speed installation.