White picture mount, also called passepartout, that fits in a frame sized 30x40cm (11 ¾ x 15 ¾"). The opening in this picture mount is 20x29 cm and fits a poster sized 21x30 cm (8 ¼ x 11 ¾ in"). Using a picture mount will elegantly frame and accentuate the design of the poster. A mount can provide balance between the poster and frame, but can also be used to create contrast. The white picture mount is pure white and true to color, including the core of the picture mount. The color of the paper is an exact match to the paper used in our posters. The paper is acid-free. Height: 40 cm Width: 30 cm Thickness: 1.5 mm Material: FSC© Certified Premium Paper