This has to be a must have for your craft box, an A3 size cutting mat, one side is for cutting, whilst the other side is a scoreboard. This set also includes a scoring ruler, 6" bone folder, snap off cutter and and envelope triangle. 

The scoring ruler sits on the scoring side of the mat which means you will be able to cut, score, make envelopes and gift boxes and with a size of 45cm x 30cm (18" x 12") there is space for large sizes as well as small. 

There are full instructions on the packaging as well as the envelope triangle.