... 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: Steel or plastic.(7) Use ... 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, 4.80/4.00-8, 5.00-6, 6.50-8 rubber wheel 4.80/4.00-8 ...