The Campagnolo 10 speed Record grade chainring features AFT(anti-friction treatment) on a lightweight but durable 7075 alloy. The treatment increases durability and wear time. Pick-up teeth are installed for quick, positive shifting. The ring is also a 5-bolt, 4arm design which means it only works with Record 10 and 2004 and newer Chorus 10 crank arms that feature the hidden bolt assembly. Campagnolo part FC-RE553.