BLOODSPORT R.O.C. OUTSERTS RED .255 6 PK. The R.O.C. System was designed to strengthen micro-diameter arrows for better penetration and performance upon impact. Extensive testing found micro-diameters excel in flight, but categorically fail in penetration and impact. Poorly engineered outserts add stress to arrow walls and tips, ultimately causing failures. The R.O.C. System addresses these issues with a patented shock-absorbing and energy-transferring design that maintains accuracy and maximizes impact.