Check the listing for details. FIRENOCK Hunting lighted nock E3h-R crossbow arrows (Standard package). Condition: New. Listed at 72.90 USD. Brand New FIRENOCK Hunting lighted nock E3h-R for super slim arrow (Standard package)(E=E style nock, 3=3 pack, h=hunting circuit, R=red LED)Firenock is the most advanced lighted nock system on the present market. Firenock employs Missile Arming Technology and Fuzzy Logic Technology which make Firenock not requiring any actuator / pushing / twisting to turn on or off. Firenock lights itself up once it is fired / shot (i.e. by G-force = change in speed, a Missile Arming Technology). With Fuzzy Logic Technology, Firenock will stay lit even the game is jumping vigorously and even hitting into hard objects (bone, stone, concrete). Firenock is waterproof design which it will stay lit even your arrow is submerged into water. To turn Firenock off, just hold your arrow perpendicular to the ground motionless for 7 seconds and drop the nock against a semi hard surface. Firenock is simply a smart nock! See Firenock lighted nock on youtube (just input " firenock nock") Features:USA made G switch technology, LED activates when it is shot No actuator magnet, actuator adaptor or sticker is neededField replaceable nockField replaceable batteryUltra bright LED (11,000 LUX)Ultra long runtime24K Gold plated connector for best reliability and corrosion resistanceBlood proof / Waterproof designCan shoot into hard objects / over 290 fps and stay litWeighs ~20 grain with the nockContents:3 pcs Hunting circuits in red6 pcs "E" style nocks in red3 pcs Extreme Shock End Caps with O-rings1 pc End Cap Installation Tools3 pcs batteries with O-rings1 AG0GEL for gluing End Caps Arrow fit list (Medium Size):Alaska Bowhunting: GrizzlyStik (ID 0.212") (requires custom fit/shave)Arrow Dynamic: Nitro Stinger (ID 0.211") (requires custom fit/shave)Beman: CenterShotCarbon Express: Predator™ II (2040 and 3050), Thunderstorm 29Easton: ACC Pro Hunter, A/C/C 3-49/390, Aftermath, ION, Pink ION, Da'Toyurch, Hexx, ST Epic Realtree HD Green, ST Epic, ST Carbon Excel, Bloodline, Wildthing, Traditional Only, can also fit A/C/C 3-39/440Gold Tip: CAA .400High Country: Speed Pro (ID 0.233") Notes: Gel type super glue (e.g. Firenock AG0GEL) is needed to successfully install Extreme Shock Battery End CapClean arrow shaft with acetone before installation of End CapPut glue into the cleaned arrow shaft (do not put glue on End Cap / Tool)Push End Cap with tool straight (do not rotate) into the arrow shaft during installation of End CapPlease remove field point if available before installation of end cap as back pressure will push the end cap out of the shaft