Believe they are made by VEC. And to the question of why not Meteor or OEM, I ask why not? The price is much lower and so far they haven't given me any issue. Have one saw with out to a test logger, and its already got more time on it than most hobby/firewood types would put on their saw in their life time....no issues. Sometimes we make issues where there isn't one, often to sell or justify options that simply don't have an economic reason. For example, you can spend over $100 on a forged and with a special surface finish. For most here what is the true benefit? And it's OK to have the "bling" factor, I get that. So when I took the bait on these VEC piston's, I do so with eye's open to the supposed differences between them and literally all the other solutions. But decided to try these to make a point.
SO far they have NOT disappointed. One of the better "bang per buck" options out there actually as they slip in an OEM cylinder. And I have YET to see an aftermarket cylinder for 372's that are as well designed and manufactured with materials at the same level as OEM (Mahle) despite what IR says...
And yet again I love running these things with a back ground of knowledge of so many experts saying they shouldn't grace a good saw....but there they are. And the chips keep coming.