24 x 1.75/1.90/2.125 Schrader valve (American) suitable for 24 inch children’s bicycle tyres.
The air chambers are puncture-proof, made of butyl, a type of synthetic rubber very elastic and at the same time airtight. Depending on the compounds used, you can have different product qualities: the inner tubes have extreme characteristics in terms of air tightness and elasticity and can be used for a wide range of tire sizes.