1.Size:350-4,350-5 400-6 250-4 350-6 400-8etc. 2.good ... . 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 ... %,30%,40% and more2.4.Wide Range of Use: for wheel barrow,hand trolley,tool cart etc 2.5 wheelbarrow wheel. 3.50-5 ...