SODIAL(R) 4 x 13 x 5mm Shielded Micro Mini Small Wheel Ball Bearings 624Z 5 Pcs Product Name : Ball Bearing;Model No. : 624Z Material : Metal;Color : Silver Tone Inside Diameter : 4mm / 0.16";Outside Diameter : 13mm / 0.51" Width : 5mm / 0.2";Net Weight : 16g Package Content : 5 x Ball Bearings