... 1) Name: rubber wheel(2) Color: Black ,red, yellow ,green ,gray(3) Bearing: Ball, roller, ... 2.50-4, 2.50-8, 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 ... , 4.80/4.00-8 ... , 5.00-6, 6.50-8 ...