Flex Fletch LIT Lighted Arrow Nocks .204 Set of 3 Green. 204". Featuring an external on/off switch that requires no tools these nocks automatically light up when the arrow is shot providing excellent visibility day and night. The long-lasting battery ensures the nock stays lit for up to 48 hours. Each pack includes three lighted nocks each weighing 18 grains providing an affordable solution to protect your valuable arrows during practice or hunting. Features of Flex Fletch LIT Lighted Arrow Nocks: Fits most carbon shafts with an ID of 0.204" External on/off switch no tools needed Super bright: visible day and night Long-lasting: stays lit for up to 48 hours Auto on: lights up when the arrow is shot Cost-effective: saves expensive arrows Weight: 18 grains Pack of 3 lighted nocks Package Contents: Flex Fletch LIT Lighted Arrow Nocks Flex Fletch LIT204GR12: LIT Lighted Arrow Nocks .204 Set of 3 Green