Material:Electro zinc-plated steel.
Polyamid PA 66 ball.Note:Ball transfer units with plastic balls are particularly suitable for transporting sensitive materials such as polished aluminium, brass and steel sheets or glass.
They have a felt seal to protect against dirt.Drawing reference:
1) load ball
2) bearing balls
Form B: cap and housing electro zinc-plated, bearing balls steel.
Form C: cap and housing electro zinc-plated, bearing balls stainless steel