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This is an Align 4x7x2.5mm/3x8x3mm Bearing Set. These bearings are used in the Align T-Rex 500 flybar seesaw holder.
(2) Bearing MR74ZZ (Φ4xΦ7x2.5mm)
(2) Bearing MR83ZZ (Φ3xΦ8x3mm)
This product was added to our catalog on June 25, 2008