bicycle valve 1.best quality with reasonable price 2.passed ISO9001 &TUV quality certification 3:PASS LEAK TEST bicycle valveThe snap-in type can be quickly mounted to the rim,it is flexible in nature so it may provide complete air-seal even when it is bent for air senvice or tire pressure check made with special rubber(as EPDM)compound to resist to zone damage and prevent premature delerioration ...