Oregon is a big OEM supplier. And whoever is the manufacturer of Marbane/Marbain MB blades. My biggest concern is a blade that is true, hole is punched in the center (yes, this isn't always true), and that the lift wing is large enough. Often times, aftermarket blades don't have an agressive lift wing, or they're bent or tweaked. They must also have a fully sharpened cutting edge. Also, for me to order online and save, they must arrive at my door for a similar price that I'd get at a dealer.