Lil Red Barn Stihl 021, 023, 025, MS210, MS230, MS250 Crankshaft Bearings & Seals Stihl,9503-003-0340, 9638-003-1581, 9639-003-1585 Ships from The USA Wide temperature range Mobil Polyrex EM2 (-40 to +350 degrees) lubrication Noise tested before and after lubrication Passes V2 noise vibration standards for smaller bearings and V3 standards for larger bore Finely honed superfinished raceways for long life and low noise Meet or exceed ABEC 3 tolerances for high quality level