Welded aluminium construction; Very light and hady; With 2 innovative plastic safety handles; With 2 fivearm star wheels; Screwed; Fivearm star wheels of grey non-marking thermoplastic rubber tyres on plastic wheel rim with precision deepgroove ball bearings; Thread guard; Pneumatic tyres on steel wheel rim or solid-rubber tyres on special plastic wheel rim with precision deepgroove ball bearings and plastic wheel cap.