Check the listing for details. Altra Centrum 166 Premier Arrows .001 350 6 pk.. Condition: New. Listed at 109.99 USD. Altra Arrows Centrum Premier line sets the mark for quality with industry leading straightness of .001?. Using state-of-the-art measuring equipment to verify arrow shaft and component straightness, along with Altra's weight matching process ensures 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.