Compatibility: intake & exhaust valve stem set fits el250 eliminator ex250 ninja gpx250r zzr250 kle250 anhelo motorcycle, offers standard fit for listed 250cc models material build: heat-treated high-strength alloy steel, resists high combustion heat to prevent bending and deformation performance: finely ground smooth stem lowers friction loss, tight valve seal solves compression loss and blue smoke issues machining: strict uniform dimension tolerance, no extra modification needed during cylinder head overhaul installation usage scene: small displacement motorbike engine spare, fixes weak acceleration, misfire and worn aging original valves, Manufacturer: CNLJPHFHO