They are GF Smith Colorplan paper Duplex to give a total weight of 540gsm (I think), then White foil for the logo on the front and PFL silver for the back details. My clients are loving them I work with a lot of print media clients who eat sleep and breath good design and print, sitting in meeting my clients sit there feeling and exploring the cards, the texture and weight is sublime and the foil print is really unique. They certainly set me apart from my competition and compliment my photography really well. The guys at fuse design (fuse-design.co.uk/) have yet again done an amazing job.