LDO Motors MGN12H-1R-300/350/400 Linear Rails with Carriages

LDO Linear Rails are high quality and provide for superior performance with less prep work than some of the cheaper or generic alternatives. 

Note - for a Voron Trident (and other)  users you require rails 50mm larger than you bed size, you will need 8 of these rails (please check your BOM if you're making build to confirm how many mms you need)