Quill Carbon Arrows are specifically designed for use with Excalibur’s TwinStrike and Micro Series crossbows.16.5? Arrow Length250 Grain Arrow weight.003 straightness tolerance2? Blazer vane with a 3 degree offsetEquipped with Rhino NocksCompatible CeaseFire Technology crossbows or any that utilize flat-back nocks Excalibur Quill 16.5" Carbon Micro Crossbow Arrows 72pk 22QV16-72