Ultralight TPU inner tube, just 28g +/- 1g Huge weight savings, you can save over 100g vs regular butyl innertubes, best $/g saved. TPU innertubes are 2x more puncture resistant than lightweight butyl innertubes. Rolling resistance is reduced by aprox. 2w per wheel. Packing volume in your saddle bag is reduced by 50%, allowing for an extra tube and while still saving weight. NOTE: do not inflate the innertube over 5psi outside the tyre, doing so will void warranty and damage the innertube.