A cable tie system for simultaneously assembling and applying cable ties from a continuous length of strap material and a plurality of individual cable tie heads. The cable tie heads are molded of plastic with a pair of parallel cable tie strap passages and a metal pawl retained in the plastic between the two passages and having pawl teeth that project into each of the strap passages to engage the strap material at two spaced positions when it is slid through one of the passages around a bundle of wires and into the second of the passages.