... plastic 3 Size : 16"x4.00-8 4.00-8 rubber wheel : Strengh: 1 High rubber content2 medium ... PU foam tyre, pneumatic wheel, solid wheel etc.2.Size : PU foam tyre(6x2,2.50-4,3.00-4,3.50-6,3.50-4,3.50 ... ,4.80/4.00-8,etc.)pneumatic wheel(6"x2",8"x2.50-4,200x50,10"x280/ ... 250-4,10"x3.50-4,13"x3.50-6,13"x3.00/3.50-8 ... ,12"3.50-5,3.50-7,14"x3.50-8,16"x4.00-8,18"x6.50-8,etc)3.Rim ...