This 78mm piston rings and wrist pin kit is compatible with 250 SX-F (2013–2018), 250 XCF (2014–2017), 250 XCF-W (2014–2016), and 250 EXC-F (2014–2018).The kit includes one piston, piston rings, and a wrist pin.It is designed to match OEM specifications for part numbers 77730007100I, 77730007100II, 79030507000I, 79030507000II, 79030207000I, and 79030207000II.Standard size (STD) with color matching components.