Excalibur Crossbow Diablo 18" Illuminated Carbon ARROW-3-PACK For use with Excalibur's Matrix Series crossbows (sold separately). Flatback insert eliminates the need for nocks; provide more reliable string contact. Heavier front insert boosts front-of-center weight for superior accuracy. Accelerated force from being shot activates the Lumenok illumination. Spined design. Includes 3 arrows and a 3-pack of Lumenok illuminated nocks. Length: 18". Vanes: 2". Model: 22DV18-3. Made in Canada.