1.Size:350-4,350-5 400-6 250-4 350-6 400-8etc. 2.good gas tightness 3.13x3 solid wheel 4,OEM accepted ... Size:6"x1.5,8"x2.50-4,10"x3.00-4,10"x3.50-4,12"x3.50-6,13"x3.25 ... : Natural rubberInner Tube Rubber Percentage: 20%,30%,40% and more2.4.Wide Range of Use: for wheel barrow,hand trolley,tool ...