12mm Bearing/Bushing LMF12UU Linear Motion Inner Diameter - 120mm VG090CP0 bearing has Brass balls

VG090CP0 bearing has Brass balls retainer

or even in TANDEM (DT)

Oil Lubrication: 15

Equal: 6011 RS / 6011 2RS

S6304 Open Ball Bearing

12mm Bearing/Bushing LMF12UU Linear Motion Inner Diameter - 120mm VG090CP0 bearing has Brass ballsLMF12UU Linear Ball Bearing Works with 12mm Shafts LMF12UU Linear Ball Bearing works with a 12mm Shafts, Size is 12mm x 21mm x 30mm, the inner Diameter is 12mm, the outer Diameter is 21mm and the Length is 30mm, Bearing has Built in Rubber Seals. LMF12UU Bearing Linear Ball Bearing Size: 12mm x 21mm x 30mm Inner Diameter: 12mm Outer Diameter: 21mm Length: 30mm Quantity: 1 Bearing Dynamic load rating Cr: 510 N Static load rating Cor: 784 N