With this legendary single gear, Wolftooth kick-started its production into the form we know today. The derailleur is made of durable and lightweight aluminum that, thanks to the Wide/Narrow tooth profiling, will last far more miles than competing derailleurs from other companies. Fits all brands of 104 BCD handles. The Drop-Stop ST version is designed for 12 speed Shimano chains only. Weight: 30t - 36g | 32 - 47g | 34t - 56g | 36t - 60g | 38t - 66g Material: 7075-T6 aluminum Made in USA