A3 Drawing Board comes with Metric System, whose inner sheet size is 42 x 29.7 cm (A3 size).The drawing board made of unbreakable Acrylic material for durability and the drawing surface is very stable and solid for any design project.Parallel straightedge with STOP and GO locking/unlocking action guides your drafting precisely. Dual rail system is handy for ensuring straight lines, as well as clamping the paper securely in place.Ergonomic design for easy and comfortable working. Great for student, engineer, artist and architect.What's in the packing? A3 drawing board x 1, sliding set square with Protractor x 1, sliding straightedge with protractor x 1, rotating T-square with protractor x 1 .