uxcell 5 Pcs Deep 5mm x 16mm x 5mm Groove Ball Wheel Bearings for Roller Sport Product Name : Groove Ball Wheel Bearings;Type : 625ZZ Materal : Carbon Steel;Outer Diameter : 16mm / 0.629" Inner Diameter : 5mm/ 0.196";Thickness : 5mm/ 0.196" Color : Silver Tone;Weight : 24g Package Content : 5 x Groove Ball Wheel Bearings