Lub cev ua los ntawm 1.2mm txias dov steel phaj es tsis txhob ntawm 0.8mm, muaj zog khoom. With 2 fixed wheels and 2 nylon braked wheels with 5" size. Including 2 universal wheel with brakes. Lub laub yog tsav tau yooj yim thiab tuaj yeem nqa tau ntau dua.