Traxxas brand 2 pack of 5X11mm Ball Bearings for Traxxas models. FEATURES: Metal bearing construction Blue rubber dirt shields YOU WILL RECEIVE: (2) 5X11mm ball bearings, Part #5116 SPECIFICATIONS: Inside diameter: 3/16 (5mm) Outside diameter: 7/16 (11mm) Width: 5/32 (4mm) description revised by: DB October 26, 2012