this is it

durable and lightweight

This unique design features six larger diameter balls instead of the seven balls used in most 608 bearings

100% UV protection reduces eye fatigue and long-term sun damage

Quantum Bearing Science Metallic Series 4T this is itA twist on the classic. The Metallic series bearings are made with high purity, high quality carbon steel for the inner outer rings and roller balls. Then they run the raceways and roller balls through a proprietary diamond finishing process. From there Quantum includes high tensile strength, hydrophobic retainers these bearings were designed with stability, flow, and mechanical strength in mind. Each bearing is coated using their GraphFlo(TM) process