Engineered using the same high-performance processes used in advanced tournament arrows A great value for new archers looking to progress to higher poundage bows quickly Construction: Multi-layer wrapped 100% carbon-fiber Outside diameter: 0.228”(600), 0.219”(800), 0.214”(1000), 0.211"(1200), 0.206”(1400), 0.202”(1600), 0.200”(1800), 0.198”(2000) Inside diameter: 4mm Note: This item does not include nocks or points, all components are sold separately. 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)