Ball Bearings 35x55x10 mm 6907ZZNR Chrome Steel Metal Shields with Snap Ring (C Clip) 6907ZZNR Ball Bearings with Snap Ring (C Clip), this is a popular size that could be used in many applications, size is 35mm x 55mm x 10mm. Bearings are made of Chrome Steel and can rotate up to 12,000 rpm, each bearing has 2 metal shields to protect the bearing from dust or any possible contamination, also bearings are pre-lubricated with grease