Features: Dynamic Chain Engagement (DCE) is used to hold the chain & help prevent chain jump out. This is achieved by using a broader & taller tooth profile in conjunction with a special hooked leading edge & alternate profiled tooth shaping. This provides superior chain retention, lower driving sound, increased durability & drag to a minimum Hollow gear construction for optimized rigidity, lightweight & durability Durable teeth using a Stainless steel construction supported by a carbon & alloy carrier body on 36T/34T, alloy carrier body on 32T/30 T Dyna-Sys 11 HG-X11 11-speed chain compatible Available in 30T/32T/34T/36T