These miniature bearings are made of carbon steel
They are double shielded to avoid contaminants entering and save lubricant.
Bearings have a 3mm inner diameter, a 8mm outer diameter, and a 4mm thickness.
These are great for small hobby 3mm shaft/rod projects such as 3D printer, quadcopter or ship model.
There comes total 10 pieces miniature bearings which you may use for many different projects.
Material: Carbon steel
Inner Diameter: 3mm / 0.12"
Outer Diameter: 8mm / 0.31"
Thickness: 4mm / 0.15"
10pcs x Bearings