Carbon Tech's super fast and ultra light arrow. This all carbon composite arrow gives the 3D and field shooter all the speed they could ask for. If you are a speed freak, then this is the arrow for you. One of the most durable super light, thin walled arrows available today. Using our proprietary multi-directional layered design gives you a much more accurate arrow. Pushing the boundaries of the 5 grains per pound IBO rule, the CT Cheetah gives you a super fast arrow and allows you to use a much heavier point weight. This gives you more stability without losing speed. We offer four different size arrows including a light spine for women, kids and men with short draw lengths. Weight in grains Size Spine 5.3 Grains per inch (gpi) - 650 (3D) and 25/50 (standard) - .650" 6.1 Grains per inch (gpi) - 525 (3D) and 35/60 (standard) - .525" 6.4 Grains per inch (gpi) - 400 (3D) and 45/70 (standard) - .400" 7.9 Grains per inch (gpi) - 300 (3D) and 55/80 (standard) - .330"