Portrait or landscape.
eBay
Photo Frame Picture Decor Picture Frame Award Holder A3 30 X 42 Cm Poster Desktop Blank Mounting Wall Hanging Metal Poster Frame
Aliexpress UK
The Perspex/ styrene is just as clear as glass if not even clearer. The sheet is has very high clarity and there is no difference from glass once up on the wall.
eBay
15Pcs White Photo Mats Rectangle Paper Mounts For 6/7/8/10/16 inch A4 A3 Picture Frames Photo Decor Photo Mat Paper Photo Frame
Aliexpress UK
eBay
15pcs Photo Mats Rectangle Paper Mounts for 7/8/10/12 Inch A4 A3 8K Size Photo Decor Photo Mat Paper Photo Frame Accessories
Aliexpress UK
★ High-Quality solid MDF foil wrapped mouldings with high quality MDF backboard ★.
eBay
5Pack Magnet Picture Frame Children Art Picture Holder Wall Photo Organizer Display for Home Office Advertise,A3/A4/A6/30x30cm
Aliexpress UK
The mount viewing window will be slightly smaller than the size given, approx 3mm of your picture will be covered on each side. The viewing window will be slightly smaller than the size given, approx 4mm of your picture will be covered on each side, this is to hold everything in place.
eBay
Picture Frame Metal Poster Frame Classic Aluminum Photo Frames For Wall Hanging A3 A4 30x30 Certificate Frame VCC
Aliexpress UK
Approx 3-4mm picture would be hide in viewing window to hold the picture.
eBay
Nature Wooden Classic Photo Picture Frame A4 A3 Black White Coffee Wood Color Certificate Frame with glass for Wall Poster Frame
Aliexpress UK
Chunky moulding! There is protective plastic film on both side of the styrene sheet. Picture shown are for illustration purpose only.
eBay
3pcs Classic Black Wood Color Wooden Photo Frame A3 A4 Picture Frame Poster Canvas Frame for Wall Mounting Desktop Display
Aliexpress UK
Black, White, Oak, Dark Oak, Walnut, Beech, Silver. The viewing window will be slightly smaller than the size given, approx 4mm of your picture will be covered on each side, this is to hold everything in place.
eBay
Wood Frame Black and White Photo Wall 9x13 13x18 A3 A4 Bedroom Accessories Wall Hanging Picture Frames Desk Certificate Frames
Aliexpress UK