These pistons are developed for Twin Cam 103 (1691CC) 2014-2016 Mount Rushmore with the Twin Cooled cylinder heads and give a 10.5:1 compression. Like all Wiseco pistons these are forged, but feature ArmorX piston coating and ArmorFit skirt coating for reduced wear and auto-adjustment to the cylinder wall. Kits include 2 pistons, matching ring set, chrome wrist pins and piston pin locks.