TRF35GUUE NB Triple Wide Round Flange Pilot End Slide Bush Made in Japan:NB Linear Systems Nippon Bearing Linear Systems TRF35GUUE NB Triple Wide Round Flange Type Miniature Pilot End Slide Bush, The retainer material is resin, It is seals on both sides, series mainly used in the USA, NB brand (Nippon Bearing Linear Systems), Made in Japan.