I received two wonderful paper sample books recently from paper specialists Mirri (BTW, this is not an affiliate post). The samples allow you to see how the reflective quality of the card can be used, as well as providing tear-away sections for mailing to clients. Their site reads:
Mirri – A division of Celloglas has been a leading brand since the early 70’s, specialising in producing quality decorative materials on board, card and paper. Mirri is widely recognised by brands, retailers and designers as a tool to communicate quality, innovation and brand category leadership.
The book samples showed an impressive collection of reflective card along examples of it in use: