When implementing a loyalty card program, give your customers a full size card and a couple of keytags to give them a choice and make it easy to keep a card handy for use. Full size card can have an encoded magstripe if needed. Keytags are barcode only.
A 4″ x 6″ postcard printed in full color front and back, with a quality full-color plastic gift card or promotional card, hot-glue affixed for cost-effective results when distributed at events, in-store or by mail (in an envelope).
Restaurants do especially well with these all-in-one postcard/gift card direct mail campaigns. Paper coupons get thrown away, but a $10 gift card is hard to resist. Brilliant, full-color printing with durable 30 mil laminate finish lets you create a high-impact product. 4.25″ X 5.652″ with removable CR80 card.