300 x 210 mm, Mounts, Backs, & Bags, Pack of 5 Aperture size:Equal borders of 30mm - exact aperture size 240mm x 150mm These backing boards are made

These backing boards are made from the same quality mountboard as our mounts

This means that the 3 inch excess will need to be folded down at the back of the mount

Outer Size to fit an A3 frame - exact outer size 420mm x 297mm

Scroll through the pictures to find the aperture size that best fits your artwork

Outer Size to fit a 10 x 8 inch frame - exact outer size 251mm x 201mm

300 x 210 mm, Mounts, Backs, & Bags, Pack of 5 Aperture size:Equal borders of 30mm - exact aperture size 240mm x 150mm These backing boards are madeOuter Size exactly 300mm x 210mm, 30cm x 21cm 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.