1.Size:350-4,350-5 400-6 250-4 350-6 400-8etc. 2.good gas tightness 3. 2.50-4 Pneumatic Wheel 4,OEM accepted ... etc.2. Pneuamatic Wheel=Tyre + Tube + Rim assembled2.1. Main Size:6"x1.5,8"x2.50-4,10"x3.00-4,10 ... "x3.50-4,12"x3.50-6,13"x3.25/3.50-8,14"x4.00-8 etc2.2. Tyre ... more2.4.Wide Range of Use: for wheel barrow,hand trolley,tool cart etc 2.5. 2.50-4 Pneumatic Wheel 2.50-4 Pneumatic Wheel ...