Size: 16x2.125 Replacement inner tube, also fits 16x1.75 16X1.95 16x2.10 16x2.125 tires; Fits vehicle with 16 inch tires and wide between 1.75 to 2.125 inch tires; Please confirm your existing tube size to ensure that they are properly replaced Wide Compatibility: These heavy duty 16x1.75/2.125 inner tube Fits most 16 inch tube electric bicycle, bike, motorcycle, 3-wheeler gear jogging stroller and most kids bikes; Like RoyalBaby, Joystar, Dynacraf and Revolution SE/Pro/Flex/SU/Ironman Premium Quality Inner Tube: These 16x2.125 inner tube is made of high-quality butyl rubber, which is better in air tightness, elastic damping and aging resistance than natural rubber. With thick butyl rubber that absorbs shocks, you won’t feel the bumps and hollows because your bike will glide along, protecting you from the force Better Air Tightness: 16x2.125 bike tube made from butyl rubber, fitted with CR202L-A60 angled valve stem, ensuring straightforward installation and offer excellent sealing and air retention Package Includes: 2*16x1.75/2.125 tire tubes and 2 valve caps; Tips: Before installing, check to see if the inner tubes are completely sealed by putting them in water, if there are any bubbles, they are already damaged; If there are any quality or other issues with the products, Please feel free to contact us Heavy Duty 16x2.125 (16"x2-1/8") Thick Butyl Inner Tube, 16 Inch Scooter Tire Tube with Angled Valve Stem