Product Name : Deep Groove Ball Bearing;Type : 6201RS Material : Carbon Steel, Rubber;Outer Diameter : 32mm / 1.2" Inner Diameter : 12mm / 0.5";Thickness : 10mm / 0.4" Color : Sier Tone, Black;Weight : 35g This good precision 6201RS bearing provide high speed and the convenience of removal shields for cleaning and relubrication. This is the perfect bearing for all your roller and skateboard applications. Bearing has Rubber Seals to protect the bearing from dust or any possible contamination, also bearings are pre-lubricated with grease. Package Content : 1 x Deep Groove Ball Bearing Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.