... ,red, yellow ,green ,gray(3) Bearing: Ball, roller, nylon or without bearing(4) Type: Solid, pneumatic, PU ... our equipments are the most advanced here. 3. self-sufficiency manufacture ZINC OXIDE and SULFUR ... following size : 200x50, 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 rubber wheel 4.80/4.00-8