This is a blue multi-strip ticket which can be used on trams, metros and buses in Amsterdam and all over Holland. Works out about half the price of buying a ticket on board.
See www.gvb.nl (Amsterdam Transport organisation, mainly in Dutch)
Good English explanation of the Strippenkaart at
www.amsterdamtips.com/getting-around-amsterdam-the-strippenkaart.php
Send your feedback or queries to been.there@guardian.co.uk
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