1、Made of high quality titanium and iron, stable and durable. Deep groove ball bearings.​ 2、These bearings are pre-lubricated with grease. 3、Selection of metal material, good quality, long service life. 4、Smooth operation, low friction, high performance and long life. 5、Applications: skateboards, inline skating, scooter. Features:  Made of high quality titanium and iron, stable and durable. Deep groove ball bearings. These bearings are pre-lubricated with grease. Selection of metal material, good quality, long service life. Smooth operation, low friction, high performance and long life. Applications: skateboards, inline skating, scooter.  Specification: Material: Titanium, iron Color: red, purple, yellow (optional) Options: red ABEC-7, red ABEC-9, purple ABEC-7, yellow ABEC-9  Size(outer diameter*inner diameter*height): 22*8*7mm/ 0.9* 0.3* 0.28in Weight: Approx. 94g Package List: 8 x Skateboard Bearing