This Technik Art Tracing Pad is A4 in size and contains 40 sheets of 63gsm paperTracing paper is named as such for its ability for an artist to trace an image onto it. When tracing paper is placed onto a picture, the picture is easily viewable through the tracing paper. Thus, it becomes easy for the artist to find edges in the picture and trace the image onto the tracing paper.This paper is ideal for overlays in pen and pencil and would be perfect for any artist