TRF13GUU NB 13mm Slide Bush Bushings Miniature Motion Linear BearingsTRF13GUU NB Triple Wide Round Flange Slide Bush Made in Japan: NB Linear Systems Nippon Bearing Linear Systems TRF13GUU NB Triple Wide Round Flange Type Miniature 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. Item: TRF13GUU NB Bearing Type: Linear Slide Bush Bearing Inner Diameter: 13mm Retainer Material: resin Quantity: One Bearing Dynamic