SMF8GUUE NB Round Flange Type With Pilot End Miniature Slide Bush Made in Japan:NB Linear Systems Nippon Bearing Miniature Linear Systems SMF8GUUE NB Round Miniature Linear Slide Bush Miniature Slide Bush, Bearing is seals on both sides, The retainer material is resin, series mainly used in the USA, NB brand (Nippon Bearing Linear Systems), Made in Japan.