... ) Type: Solid, pneumatic, PU foam, semi-pneumatic, hollow etc.(5) Material of tire: Our rubber wheel has high natural rubber rate, high ... elasticity, rub resistance, natural rubber tire and steel rim make sturdy wheel.(6) Material of rim ... .00-6, 4.00-8, 4.80/4.00-8, 5.00-6, 6.50-8 rubber wheel 4.80/4 ...