... nearly 10 years, and our main professional products is the bicycle inner tube, we have many sizes and different materials. We supply to ... .75, 2.12520*1.75, 2.12522*1.75, 2.12524*1.75, 2.12526*1.75, 2.12528*1.75, 2.12527*1.75, 2.125, also ... , 1 1/2, 1 3/8, 1.95...For materials: We have Natural rubber and Butyl rubber. Valve ...