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GOOD QUALITY: Made of aluminum alloy material, which is steady and durable for long time use USEFUL: Lengthen the presta valve, easy for inflation of tire SUIT FOR: Wildly compatible with various bikes MORE DETAILS: 2 pcs in one package, for one bike.Length: Approx. 60mm / 2.4inch EASY TO USE: Inline extensions are installed between your existing valve stem and the Presta valve core, creating a more reliable seal