Features 1.  2. Two New 20" x 1.75 to 2.125 Schrader Valve Bicycle Tubes.  3. Bulk packaged, no retail packaging is included. Standard 0.85mm thick butyl tube.  4. 32mm Schrader (Regular) Valve / Removable Core. 5. Fits 20" bike wheels and 20" upright bicycle wheels.  6. Important note for inflating any brand of tube: When replacing the inner tube of a bicycle, carefully check the inside of the outer tube for foreign objects, and ensure that the inner tube is completely placed inside the outer tube. After installation, inflate a little to ensure that the inner tube is completely installed in the outer tube. Once filled, do not inflate it tightly, so it is easy to burst the tire. Specification Labeled Size: 20 x 1.75/2.125 Valve Type: Schrader Valve Valve Length: 32mm (standard bicycle tire Schrader valve length) Tube Compound: Butyl Tube wall thickness: 0.85mm Weight: about 132g Note These tubes come bulk packaged without any retail packaging included. Please check the side of your tire or on your old inner tube for the proper size, valve type and valve length. Package List 2 pcs 20"x1.75 /1.95/2.125 Schrader Valve Bike Tire Inner Tubes