Please note that the "double sided" A4 flyers do not come in 80gsm bond, 90gsm or 100gsm.
If supplying your own artwork - please follow these specs:-
Finished Size (297mm x 210mm)
Bleed size - add 2mm each side (301mm x 214mm)
Safe zone - 3mm inside finished size (291mm x 204mm)
View sample here