All Spirax Graph Books are printed on quality bond paper. The grids are clear and printed in green so that the grid can be easily eliminated from pages that need to be photocopied | All graph books are seven hole punched for use in ring binders | Top opening with perforated pages | Grid ruling only appears on one side of the paper | Printed in green so they can be easily eliminated from photocopies | 7 hole punched for use in 2, 3 or 4 ring binders