... 4.light weight,acid and base resistant Pu foamed wheel 12x3.50-5"Detailed technical information:1,Tire Material = ... mm7,Hub length = 70 mm8,Hole dia = 20 mm9,PU weight= 1.10 kg10,Total Weight =1.45 kg11, ... solid wheels,and aslo OEM service for different colors PU Foam Wheel for any sizeIf you are interested in ... We are sincerely looking forward to be your supplier.Size for sale: 6'',8'',8.7",10'',12'',13 ...