Lumen-Arrow bolts are 100% carbon bolts that are equipped with Lumenok brand lighted arrow nocks. The Lumenok is activated upon the shot and relies upon the conductivity of the shaft. NO switches or magnets required. The Lumenok is designed to be used over and over to allow archers to follow the path of their bolts. Each Lumenok has easily replaceable batteries for dozens of well lit shots.