Body in AlMg3 light alloy sheet, anodized (10 micron) with ribbed walls. Not perforated. Upper rim dia. 30 mm with inner strengthening. With a trapeze-form cut out on the long side. Bottom light alloy frame. All around light alloy buffer. 2 fixed wheels dia. 140 mm and 2 swivelling wheels dia. 125 mm with non-marking rubber ring and zinc-plated housings.