PIN INCL. A first-class 40-ton all-carbon shaft with a straightness tolerance of ±.001". Streamlined with a small diameter ID 3.2 for less drag in the wind. This makes the Skylon Preminens the ultimate arrow for recurve and compound archery. - Micro diameter, less wind drift - high density carbon construction - Material: 40-TON Carbon - Inner Diameter: 3.2mm / .125" - Straightness Tolerance: ±.001"