I think the Spider Shaft was the best tracking device. There were no string hang-ups to deflect arrow flight. It held 1800 ft of thread. They did not have to be tied from arrow to bow, just put the arrow on the rest and shoot. The velcro on the arrow and the bow would grab and you had a trail. We used them in the 80s for bear hunting and they worked perfectly. I also used it on a whitetail hunt in 1995. Didn't need it as my buck dropped in sight, but again it worked very well.