We only offer you Michelin, Continental and Pirelli inner tubes which are made of natural rubber. In case of tyre damage, natural rubber, in contrast to the cheap synthetic rubber, slows down the air leak from the inner tube. This prevents the risk of fall since you don't have a sudden loss of pressure.
Continental inner tubes only fit closed wheel rims (4 wheel bolts inside) like the ones used for the Vespas with 8'' tyres until approx. 1965 (e.g. V1-33, VM, VN, VNA, VNB, VB, VBA, VBB)
For Vespa Super (VNC/VBC) please use Michelin inner tubes (part no. 7676224)