Many here do not understand the importance of these rails. yes they are cheap Yes, they will probably bond a bit when you first get them. You have to understand that rails of well-known brands are easily 5 times more expensive. That is a lot. A thorough cleaning of the bottom bracket and frame with rubbing alcohol to remove dust and dirt works wonders and should definitely be done. Add some new 3-in-1 light oil, mount them and they slide well. Each rail came with 2 spare bearings in case some are lost during disassembly. I bought 3 rails for a delta printer and couldn't be happier.
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