GF Smith - Trojan Grey Marlmarque 300gsm Card. This high quality A4 Marbled Card by G F Smith of London uses a unique visual effect consisting of a pale base colour with a randomly created marbling in a darker shade. It is perfect for Card blanks, bases, Die Cutting, Envelopes, Scrapbooking and Journaling. The quality of this 300gsm card is superb.