These are full ceramic! You can only use these on your road bike!
These pulleys will compliment your Shimano 11 speed, SRAM 11 & 12 speed and Campagnolo 12 speed derailleurs.
Inside the box you will find a handy little 4mm spacer - this is to be used for SRAM applications only.
**Please note these pulleys are not compatible with R9000 derailleurs...