Contactless payment cards are super convenient but the technology may allow fraud. We can be skimmed without realising it.
Cards now work with something called RFID (radio frequency ID), a technology that exchanges wireless information. It is easy for criminals to purchase an inexpensive physical device to pick up wireless signals transmitted by payment cards (providing they get really close). The information they obtain can then be used to make purchases online (but only when the online retailer is itself a little slack in its security measures).
An anti skimming promotional card-holder is without doubt a topical and well received promotional item!