Easton’s Vector is a 4mm 100% carbon-fiber arrow engineered using the same high-performance processes used in advanced tournament arrows, but priced for value conscious consumers. Multi-layer wrapped 100% carbon-fiber construction. 4mm parallel design. Straightness checked. Weight matched. Straightness tolerance: +/- .003" The Vector is ideal for archers who may be getting started in target archery or quickly progressing to higher poundage bows and needing to change arrow setups to match. Available Spine Size (Weight): 600 (7.6 gpi) 800 (6.2 gpi) 1000 (5.4 gpi) 1200 (5.1 gpi) 1400 (4.2 gpi) 1600 (3.8 gpi) 1800 (3.6 gpi) 2000 (3.4 gpi)