STRONGLIGHT chain ring ´´HT3´´ mod.17 4-arm, for 11-speed, 76mm circle diameter, aluminium 7075 T6, black self-service package, chain rings with thread, suitable for SRAM XX1, 1x11 Technology HT3 7075-T6 aluminium chain rings with a titanium-oxide electro-ceramic coating This exclusive coating provides an ULTRA HARD surface for a long life (hardend:1,5 to CT2) The friction and wear coefficient are clearly reduced (0.2-0.3) and offers noise reduction and an excellent corrosion resistance. SPECIFICATIONS:-32 teeth, inner.