A1 POSTERS (‘Greatest Hits’)
Dimensions: 549mm x 841 mm / 23.4” x 33.1”
UK
We love these wooden magnetic poster hangers from Thabto:
https://www.thabto.co.uk/products/magnetic-print-frames
(The A1 / 618mm size)
Slightly less expensive are these from Willow and Stone (I’ve not personally tried):
https://www.willowandstone.co.uk/made-in-the-uk/oak-poster-hanger.php
USA
Similar magnetic poster hangers are available in the US, if you’re based there, of course:
https://www.etsy.com/uk/listing/793823932/thin-floating-magnetic-poster-hang
A0 POSTERS (‘Every synth’)
These are large scale posters and the best option is to have a local framer frame these for you.
500mm x 400mm Design Museum poster
Again, I’d recommend the wooden magnetic frame hangers. The poster is portrait so the A2 size (440mm) width is needed.