These postcards are made from thick high-quality matte paper, so they serve as a great addition to a gift or just a thoughtful written note to a friend. Cardboard paper Paper weight: 7.67?10.32 oz/yd² (260?350 g/m²) Size: 4″ × 6″ (101 × 152 mm) Paper thickness: 0.013″ (0.34 mm) Coated outer surface Blank product materials sourced from Sweden, US, Brazil, or China