We special in produce many size of rubber wheel,solid wheels pneumatic snd so on.pneumatic wheel : 2.50-4, 3.00-4, 350-4, 3.25/3.00-8, 350-8 ,400-6, 400-8, 500-6 etc.solid 6"*1.4", 6"*1.75, 16"*4.00-8, ...