Tyre: ESD TR polyurethane, dark-grey nonmarking colour, with electrical resistance <10^9 Ω (=<1GOhm), hardness 90 Shore A, with excellent rolling resistance and elasticity and good resistance to wear and tear. Centre: made of cast aluminium.

Ball bearing bore
The housing is obtained by moulding and contains ball bearings series Z.
Axle
Axle composed of ground steel bush with bolt according to UNI EN 24017 and nut according to UNI EN 24032.
Swivel top plate bracket
Swivel top plate bracket. The plate, the ball rice ring and the fork are made of pressed steel zinc plated finish; swivel actions: double ball greased race with dust protection granted by the particular plate configuration. The king pin is integral with the top plate and duly rivetted.