arrived in bubble envelope, of course for this type of goods it is adequate. moves smooth on the shaft. however there is a little play, but that could also be due to the rod. I haven't verified the sizes not the rods nor the linear bearings. inside it has four rows of bearing balls. the metal outer tube has 2 grooves for locking rings. these are a little shallow therefore the locking must be of the right size to fit well.
Thank you saler! Everything is fine! Come in good condition!