The Stu Art MO12 12 x 16 White Picture matting are a pack of 50 rectangular picture mats made of 20 point card stock with a matte pebbled finish. The interior dimensions are 8 x 11 1/4 inches, suitable for 9 x 12 artwork. The package includes 50 loose mats that can be used as either portrait or landscape orientations. Manufactured in the United States by Stu-Art Supplies, this product is ideal for art enthusiasts looking to showcase their photography or artwork in a stylish and elegant manner. Used in art classes and school shows across the country these mats have been a staple of budget minded artists for over 65 years!