wheel center: nylon white
bearing: central ball bearing
threadguard: small nylon threadguard
galvanized sheet steel housing, pivot bearing with a double ball race, bolt hole fitting by bolt hole Ø 13 mm, housing with material strength 2.5 mm (fitting) and 2.5 mm (fork), clearance between the fork 52 mm, wheel rim made of nylon with a tread made of nylon white colored, hub width 50 mm, central ball bearing, screwed wheel axle (incl. all axle material).