Large wet & dry sheets?

[hotponyshoes]

Anyone know of a source?
Looking for 350mm square or bigger..

 

[Misterg]

Don't know about squares, but you can get large diameter discs (I was going to buy a 600mm dia disc for fettling an acoustic guitar body, but never did):

Plain & Self Adhesive Abrasive Discs - Abrasive Finishing Systems

Looking for Plain & Self Adhesive Abrasive Discs?

abrasive-systems.co.uk