SMS10GUU-OP 10mm Open Slide Bush Ball Miniature Linear Motion BearingsSMS10GUU OP Open Stainless Steel Anticorrosion: Miniature Slide Bush Made in Japan: NB Linear Systems Nippon Bearing Miniature Linear Systems 10mm Stainless Steel Anticorrosion Miniature Linear Slide Bush, It is open and seals on both sides, The retainer material is resin, SMS10GUU OP bearing is a high accuracy grade Miniature linear bushings, series mainly used in the USA, NB brand (Nippon Bearing Linear Systems), made in Japan. Item: SMS10GUU OP