24" x 1.75" to 2.125", 32mm Schrader (Regular) Valve / Removable CoreHIGH QUALITY AND DURABLE:our tubes are made of high Butyl rubber material,Better air tightness, heat resistance, and durableWIDELY FIT: our 24 inch bike tubes can widly fit 24" inch wheel , width between 1.75-2.125 tiresWHAT YOU GET :You will get 2 pack 24 inch bike tubes and 2 Tire Levers at one buy ,the Tire Levers attached,can let you easily get your tube out from the tire when changing the tubeBefore changing the tube,please check whether have some stones or sharp things that may broke the tube that stay in your tire ,if have pls clean it.When changing your bicycle inner tube ALWAYS be sure to add just a little air to the tube before installing. This gives it form so it doesn't get twisted or bunch up which may cause a pinch flat. Once the new tube is installed and BEFORE fully inflating only add a few PSI to further form the tube. Inspect for an even bead of the tire to the rim on both sides.CONTINUED.....Then, inflate to approximately half the desired PSI and re-inspect the tire bead to the rim again. If even beading all the way around AND on both sides then inflate to the recommended air pressure. This procedure is important because if the bead doesn't hook properly on the rim then as the inner tube is inflated it can sneak out between the tire and rim and go BOOM!Specification :Size: 24x 1.75/2.125 Valve Type:32mm Schrader ValveTube Compound: Butyl What is in the box :2 pack 24 inch bike tubes and 2 Tire Levers