... .longer service life 3.high load capacity 4.environmental friendly Pu foamed wheel 10x3.50-4" Detailed technical information:1,Tire Material ... rate3. polyurethane tires with the benefit of never going flat 4.Many types and varieties, it's also economy and convenient5 ... '',16'',18'',20'',24'',26'' pu foam tires 10x3.50-4 for hand truck