"5MM micro (X) diameter for a smaller profile;Harder-hitting capability for significant impact;Increased penetration with more pass-throughs;Small diameter with a thick-wall carbon-fiber core;High-strength N-FUSED carbon core with 7075 alloy metal jacket;Easy removal from high-density targets;Guaranteed straightness of ñ .001"";Weight tolerance within ñ 1 grains;Pre-installed 5 mm X Nocks weighing 9 grains;5 mm HIT Inserts weighing 16 grains;Size: 400;Shaft Weight (GPI): 10.2;Spine at 28? Span (Deflection in Inches): 0.400;Stock Length (Inches): 31.5;Field Point (O.D. Inches): 17/64;Match Grade HIT Collar (Size): 2;O.D. Half Out (Size): #2;5mm HIT 8-32 inserts included (16 grains);Pre-installed 5mm X Nocks;5mm small diameter