- The #10 is 4 1/8 x 9 1/2", and is used for invoices, alerts, membership forms, etc. - the list is endless.
- The real estate on a #10 doesn't allow you to create a graphical masterpiece, but some color
- This is for an A4 document without any folding.
- A4 envelopes are used mainly for important letters and brochures that cannot or should not be folded.