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 heavy-duty bracket with hardened ball race grooves PT
Swivel bracket made with: - Top Plate: electrolytically colonial galvanised steel plate; Fork: electrolytically colonial galvanised steel plate; Ball Race Ring: electrolytically galvanised steel plate; Dust seal: green polyamide 6; Swivel actions: double ball ring with grease lubrication; Ball race: tempered carbon steel; King pin: steel screw, class 8.8 and nut