SRA, which stands for "Supplementary Raw format A", refers to a larger paper size than the traditional standard A and B sizes commonly used. This larger size is often utilized by print manufacturers to print multiple artworks on a single sheet, which can then be trimmed down to the desired size.
Printing on SRA sheets offers several advantages, including cost savings and increased flexibility. If you have access to guillotine equipment, you can choose to print your artwork on an SRA sheet and personally cut it down. This allows you to have complete control over the finishing of your project, resulting in a more personalised outcome that meets your specific needs.