4 Schneeberger R9 300 mm Linear Rails and 2 AC9 roller elements. Came off of a Utma profile grinder, there is brinelling in the rails (indentations from the rollers). They need to be reground for precision work--with the profile grinder the carriage would not travel 100% smoothly, the indentations made it slightly jerky. If you don't need high precision they will work as is.