The Eastman Maxima RED SD 350 Carbon Arrow Shaft is a breakthrough in controlling dynamic spine in a smaller diameter (.203" ID) shaft. The high-tech carbon arrow shaft design has stiffer ends to contain the arrow's flex to what we call the "RED ZONE"(R). The RED ZONE is the section of the arrow shaft engineered to contain Dynamic Spine and make a broadhead shoot more consistently. The smaller diameter Maxima RED SD delivers improved penetration and reduces wind-drift which enables more accurate shots at longer distances.