– Compatible with most new SRAM 1x road cranks that use the 107 BCD spider with or without power meter
– Drop Stop B is 10, 11, & 12spd Eagle and Flattop compatible – These chainrings are designed to work with all 10 speed, and 11 speed chains. They also work with 12 speed SRAM Flattop, SRAM Eagle and KMC chain. They do not work with Shimano 12 speed Hyperglide+ chain
– Made in the USA from 7075-T6 aluminum alloy