Race Face Chainring Tab ShimsChainring tab shims for all cranks.Cleanly converts your triple or double chainring setup into a 1x10Required for all carbon crankarms when not using a bashguard or outer ringNecessary when you're running the 30T Race Face Single NW chainring.Sold in a pack of 4Manufacture Part Number: F10000, D40331 | Race Face Chainring Shims Black, 4 Pack