The Lumenok is a Lighted Arrow Nock that fits most popular arrows and crossbow bolts. It adds 15 grains to the weight of the arrow.
Lumen-Arrows are 100% carbon shafts that are hand squared on the nock end and fitted with the proper Lumenock to ensure ideal lighted arrow flight. They are matched within a few grains per dozen. They come in 300, 350, and 400 spines.