... quality and large quantity. Product name: bicycle inner tubeSize: 28*1 3/8x1 5/8Specifications:1.PH RATE<2002.Material:natural rubber3. ... feature of anti-aging, good gas-tightnessMaterial: natural rubber/butyl rubberDetails:Professional manufacturer in China; Good quality and competitive price ... 24x2.125, 26x2.125, 26*2 1/2, 28x1 1/2, 16x2.5, 18x2.125, 18x2.5, 16x3.0 26*1 3/8 bicycle tube