... (4) Type: Solid, pneumatic, PU foam, semi-pneumatic, hollow etc.(5) Material of tire: Our rubber wheel has high natural rubber rate, high ... , 3.00-4, 3.50-4, 4.10/3.50-4, 3.00-8, 3.25/3.00-8, 3.50-6, 3.50-7, 3.50-8, 4.00-4, 4.00-6, 4.00-8, 4 ... .80/4 ...