The QUBE Gold bearing uses 3D SWISS technology for perfect ball diameter, inner and outer wall thickness, and groove depth to ensure the best roller skating bearing on the market. Stronger steel is used here as well allowing a deeper groove to ensure less friction and faster roll. A special hard anodize process creates an even stronger steel while SSL oil and a double Labyrinth seal combine to make an even cleaner environment for a faster roll. Available in 7mm or 8mm in packs of 16.