If you really want consistent carbon arrows, you have to weigh and spine them as well as test the straightness. I bought a dozen .003 shafts some time ago, trimmed them to my normal 29" length, and glued-in the inserts. Then I put them into my box for making replacement arrows as old ones get broken or lost. When they came up in the rotation, I found that at least 2 of the dozen were not straight. They wobbled noticeably on my Arizona arrow straightener. A shaft which is .003, or even .006, should not wobble to the extent you can see it with your own eye. By that time, since I had already cut them and glued in inserts, I didn't bother to send them back. I just marked the ones that wobbled for judos. But I can tell you, from now on, as soon as I get the package, I'm going to test all of the shafts with the micrometer in the Arizona straightener and if any of them are less than spec, they're going back.