The connecting shafts (dowels) with the chair base are made of high-quality steel, while the other metal parts of the caster are made of aerospace-grade steel.
The bearing is of high-quality ABEC 9 type.
The rim of the caster is made of hard nylon plastic, specially designed for such applications.
The wheel is made of transparent elastic polyurethane that surrounds the rim.
from Sleephome
Skroutz Buyers Protection