... 2,High Speed 1w-4wrpw 3.Long life,Low noise Miniature ball bearing1,High temperature:100°-250°;2,High Speed 1w-4wrpw3 ... : W:One-piece steel crown type TW:One-piece nylong crown type J:Two-piece steel ribbon type RJ:Two-piece steel rivet ... type V:Full complement of ballsLubricant brand(oil or grease):Shell,Kyodo Yushi,Kluber Lub,Mobil,etc Miniature ball bearing MR85op ...