Easton Archery has added a 4MM target arrow to its competition line, and the details are more useful than the usual new-product copy. The X4 is an Acu-Carbon shaft with a seamless .167 inch inside diameter, and it's sold in two grades, Standard and Match. I haven't shot it, so everything here comes from the spec page, the company's own words, and how target shafts get made.
I run an archery pro shop and club in Shenzhen, and a big part of my week goes to arrows, tuning and students who want to know why one shaft flies better than another. What I look at is whether the grades really split the way the paperwork says they do, because a grade name on a box tells you nothing until you know what was measured.
A 4MM shaft is thinner than the 5.2 and 6.2 many people learned on. Small diameter is the whole point, and this one is aimed at outdoor target shooting.
Indoors, fatter shafts are still the usual choice on the 18 meter lane, so a 4MM isn't a drop-in swap for every setup. If your scores depend on the X ring and you're shooting a fat shaft now, changing diameter is a bigger decision than changing grade, and it deserves its own test.
Here's what the spec page gives you. Construction is seamless, and Easton says the Acu-Carbon process keeps spine consistent around the shaft, which it ties to reducing orientation effects. Nock ends are cut square to plus or minus .001 inch, and the page promises a no-sanding fit with Easton nocks and collars. Nock pins come in the box, but pin nocks are sold separately, so you'll want to budget for them if your setup runs them.
The grades are where it gets interesting, and also where it gets fuzzy. Standard is listed at plus or minus .003 inch for straightness. Match is listed at plus or minus .001 inch in the spec table, but the marketing copy says it improves on the earlier .001 figure, and those two lines don't agree. From the material I have, I can't tell whether the real Match tolerance is tighter than .001 or whether the copy is simply loose. I'm marking the exact Match number as unconfirmed until Easton gives a figure that matches its own table.
Get that number in writing before you pay the extra money. Until then, the grade is a bet on a tolerance nobody has pinned down in print.
Why straightness matters at all. A bent shaft doesn't fly the way you expect, and it's hard to tune one that's bent in the middle. Straightness isn't the whole story, though. A 2018 study on aluminum shafts at 25 meters found that moving from .001 to .003 inch widened the group by about 3 mm, with fletching angled 0.9 degrees. Jump to .006 inch and the group grew to 48 mm. Those were aluminum arrows, not carbon, so I read the numbers as direction rather than as a carbon spec.
The shop side is simpler, and it's where I'd start with anyone walking in. Get the fletching angled, around a degree, before you pay for a grade jump. The same study changed just the nock on one set of arrows and took the group from 44 mm down to 27 mm. That swing was bigger than the straightness change on identical arrows, and it costs a lot less than a new box of Match shafts.
There's a bench check the study describes too. Roll the shaft between your thumb and a fingernail and feel for a wobble. The authors describe a .001 inch shaft as rolling smooth, a .003 inch one as noticeably less so, and a .006 inch one as jumping. It's a rough check, not a measurement, but it takes a minute and you don't need a machine to do it.
The questions I'd ask a student before recommending a grade are the same ones I'd ask myself. How many shots a week, at what distance, and is the tuning stable right now? If the tuning is still moving, the grade won't fix it, and you'll spend the money chasing a problem that lives in the bow. That's how I'd expect it to play out from the physics, though I haven't measured it on this shaft.
Easton says the X4 comes in a range of spine sizes for target setups. The full spine chart isn't in the text I could pull, so I won't guess at numbers. Pricing isn't in the announcement either, and I didn't find a delivery date in the sources I checked. If you need either before you order, ask a dealer directly rather than trusting a number from a forum.
Gary Cornum, Easton's marketing director for technical products, put the goal this way. "We wanted to create a shaft that delivers the tuning, consistency, and small-diameter advantages serious competitors seek, while offering both Standard and Match Grade options to meet the archer's needs." I read that as a statement of intent. The grade choice is the useful part, because it lets you pay for the tolerance you can actually use rather than the one the marketing promises.
From the making side, a higher grade is mostly sorting and end-cut work. That's labor more than material, and it's the reason the price gap usually runs wider than the material cost would suggest. Whether the gap is worth it depends on whether your tuning is already tight enough to show the difference, and that's a question your own scores have to answer.
The order I'd follow is simple: start with the tuning, fix the fletching second, and then think about whether the grade is worth the money to you personally.