... .non flat wheel 2.longer service life 3.high load capacity 4.light weight,acid and base ... .50-4" Detailed technical information:1.Tire Material = Solid Polyurethane2,Rim Type = plastic rim with roller bearings3,Rim ... dirt, acid.We promise to supply you with high quality solid wheels,and aslo OEM service for different colors PU ... '',14'',15'',16'',18'',20'',24'',26'' solid tires 10x3.50-4 for hand truck