I am 100% sure that it's a genuine Hiwin rails, Please try to clean and re-lubricate them.update: I had a chat with the store but he got no complaint about this item. additionally, no negative feedback has been left - On the contrary, all the feedback are very positive. after looking at the user profile: 0 likes, 0 shares, 0 collections, 0 following, 0 makes, 0 design. I apologize but, if this some kind of competitive war - please leave it out of the project. If not - please accept my apology and ignore what I wrote. try to lubricate them and contact the store.