1.SIZE: Our 27.5 inch bike tubes fit 27.5’’ wheel (pls kindly confirm that your bike tire is 27.5inch before you buy), width between 1.9-2.125 tire. This bicycle tube suitable for your bike If its tire shows such as 27.5 x 1.90, 27.5 x 1.95, 27.5 x 2,27.5 x 2.10, 27.5 x 2.125(width is in the range of 1.9-2.125).VALVE TYPE AND LENGTH: Standard 32mm schrader valve which is the most common valve type for bicycles 2.HIGH QUALITY MATERIAL: our bike inner tubes are made of premium Butyl rubber material, Better air tightness, heat resistance, and durable. The most important feature of COWFEX butyl rubber is its air tightness, more than 8 times better than natural rubber. Heat resistance feature make it not easy to blow out with the change of temperature. The butyl rubber tire tube replacement absorbs shocks on bump road for a comfort and safe ride 3.PACKAGE INCLUDED: 2 pack 27.5 inch bicycle tubes and 3 Tire Levers .the Tire Levers attached, can let you easily get your tube out from the tire when changing the tube 4.PRACTICAL TIRE LEVER: The nylon plastic tire levers are high hardness, durable and very effective. suitable for Most of Bicycles Wheels 5.NO HASSLE: If for some reason, you are not 100% satisfied with your purchase, you can return it for a full refund