This is a package of four 5x10x4mm Ball Bearings from Tekno RC. FEATURES: Steel construction Used in Tekno RC vehicles, may also be used in any application requiring this size of ball bearing INCLUDES: Four 5x10x4mm Ball Bearings SPECS: Inner Diameter: 5mm Outer Diameter: 10mm Thickness: 4mm jxs 02/13/14 ir/jxs