This is Vee's 18 x 1 inch inner tube with a 48mm Presta valve. It is a latex tube, which keeps the weight down to 70gms.
The ISO width is 19-25mm, so match that against your tyre before fitting. The Presta shaft is threaded and the valve core is fixed, so it takes a lock nut at the rim but the core cannot be unscrewed.
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