pneumatic rubber wheels: 1. long service Life. 2.usage: wheelbarrow 3.quick deliver 4.certification:PAHS REACH pneumatic rubber wheels:size:400-8type: pneumatic wheelpicture: all the sizes we have as followes:1)5inch : 5''X1.5'',2)6inch : 6''X2'',3)8inch : 8''X2.50-4,4)9inchi : 9''X3.50-4,5)10inch : 10''X3.50-4, 10''X3.00-4,6)11inch : 11''x2.50-6, 11''x3.50-5,7)12inch : 12''x3.50-5, 12''x3.50-6 , ...