Check the listing for details. Altra Centrum 166 Limited Arrows .003 300 6 pk.. Condition: New. Listed at 89.99 USD. Altra Arrows Centrum Limited line has exhaustive attention to detail with a straightness spec of up to 0.003?? for unmatched precision. State-of-the-art measuring equipment is used to verify arrow shaft and component straightness, along with Altra's weight matching process, ensuring you are getting the most consistent arrows available. Manufactured from a proprietary blend of high modulus carbon this sophisticated construction results in Altra Arrows NO SPINE Technology, delivering an unrivaled arrow with improved tunability and increased consistency. The shafts are accompanied by premium components made from high grade aluminum and stainless steel.WARNING: This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.