Tensioner pads are injection molded Nylon with PTFE added to increase wear and friction resistance Pads are a direct drop-in replacement for the factory cast tensioner housings as well as the billet Feuling tensioner housings Tensioners are single piston, duplicating the output pressure of stock units Replacement pads include new hydraulic lash units Fit inner and outer factory HD cast housings and Feuling billet housings Made in the USA