500 x 400 mm, Mounts only, Pack of 5 21x30 Outer Size to fit a

Outer Size to fit a 12 x 12 inch frame - exact outer size 302mm x 302mm

Outer Size to fit a 15 x 15 inch frame - exact outer size 378mm x 378mm

Available in 3 pack sizes

Outer Size exactly 500mm x 400mm

Outer Size exactly 300mm x 210mm

500 x 400 mm, Mounts only, Pack of 5 21x30 Outer Size to fit aOuter Size exactly 500mm x 400mm, 50cm x 40cm Choice of aperture size Scroll through the pictures to find the size that best fits your artwork, then select it from the dropdown menu. Choice of colour On screen colours may not be true to life. Order colour samples here. Select your preferred colour from the dropdown menu. All colours are acid free white core mountboard, 1. 4mm thick.