SRA3 paper is 450mm x 320mm. Bigger than A3
SRA3 Size in CM - RA and SRA Paper Sizes
Zeta fine paper, with watermark, ribbed on both sides
Data Copy bp-116952h – Pack of 500 Sheets of A5 Paper, White : Everything Else
Guides (AP-UK)
NAUTILUS®, Recycled Printing Paper
What Is SRA3 Size? Everything You Need To Know
Paper Sizes - Tools & Resources
Paper formats - Apps on Google Play
Sappi and ISBC develop RFID paper
DESIGN CONTEXT: FORMATS: RA and SRA sizes