Just a quick note to all, Northern tool has some pink chain grinding wheels at about a third of the price of the Oregon ones. I grabbed one this morning to see how they preformed. I was quite surprised, I would rate them better than the red Oregon ones and much better than the Mole-mab units ( which are a bit too hard also pink). There is no brand name on them or their sleeve. They do not load up like the other 2 yet still retain the dressed shape very well for a number of sharpenings. The particular one I grabbed was apx 1/4" thick x 5.75" dia. at a price of $9.99, Oregon version is $29.99. So the pricing of these is more inline with that of the Mole-Mab units.