Reviewer:
Anonymous Person from Fort Nelson, BC Canada
I rolled them across the flat machined surface of my table saw to test them. Bent! Not was is needed for precision work on a 3D printer. I sent them back and ordered from somewhere else.
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For Prusa I3 MK3
February 5, 2019
Reviewer:
Keith Beaul from Penetanguishene, ON Canada
I would of given them a 5 star except these are cut rods with no beveled ends. The ends need to be filed down so as not to damage the installation of the linear bearings.
Once filed the linear bearings slid smoothly.
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Great!
July 13, 2017
Reviewer:
Anonymous Person from London, ON Canada
These shafts appear to be chrome plated which is great even though its not mentioned in the product description. I've been using them on my 3d printer for about 100 hours and seem to be holding up well.
Also its great to be able to buy bearing from a Canadian source without being treated like a mark or piece of garbage who should be taken advantage of because he isn't a large business or company.
shafts were not straight 
For Prusa I3 MK3 
Great!