The heavy Warbolts (marked by an additional stainless steel ring) are designed for our limbs with higher draw weights (90 to 150 lbs). They have a high-quality aluminum nock and a hybrid carbon/aluminum shaft, meaning there is an aluminum core running inside the carbon shaft. This complex structure offers outstanding flight characteristics and makes the arrows extremely robust. At a weight of 247 grains, these arrows are considerably heavier and strike their target with high momentum. This allows them to carry extreme momentum into the target and to transfer a high degree of energy from the limb. This momentum combined with the sharp blade makes these arrows very effective and extremely dangerous.