PROX Cam Chain. 1 x PROX Cam Chain (part number 31.4409). YAMAHA YZ 450 F(2010-2019). YAMAHA YZ 450 FX(2016-2020). YAMAHA WR 450 F(2016-2020). Strong M-type chain which has special heat treated pin plus advanced pin and link connection for maximum performance and durability.
