Deep groove ball bearings.<br />    These bearings are pre-lubricated with grease.<br /><br />Specifications:<br /><br />    Type: MR105ZZ<br />    Materal:Steel， Metal<br />    Outer Diameter:10mm<br />    Inner Diameter:5mm<br />    Thickness:4mm<br /><br />Package Included:<br />10 x Bearings