Not all chainrings are created equal & if you need proof of this look no further than these chainrings that Praxis made exclusively for Specialized. Their custom design revolves around a cold forged & hard-anodized 7075 T6 Aluminum thats incredibly stiff & very respectable in the weight department. Shifting between rings is also smooth & precise as Praxis included several elevators & specially tuned ramps around each ring. > Custom design Praxis rings For Specialized only > Cold-forged Heat-treated & hard anodize 7075 T6 Aluminum > Compatible with Campagnolo Shimano & SRAM 10-/11-speed cranksets.