These are replacement front 12mm and 15mm thru axle end caps for the Ardennes Plus GP Disc Brake and Vanquish GP wheelsets. GP wheelsets' stock build is with 12mm end caps. If you lose your end caps, these will have you covered. 

⚠️ WARNING: This product can expose you to chemicals including bisphenol-A, which is known to the State of California to cause birth defects or other reproductive harm. For more information, go to WWW.P65WARNINGS.CA.GOV