This OM is meant to be laminated (8.5 x 11) so that the children can practice writing their strokes correctly. We like to use Crayola Washable Markers on the lamination sheet, so that it can be easily washed off for the next writing session. Dry Erase Markers also work well -- you just need a bit more elbow grease to get the sheet clean. Having the children color the OM can also be a nice way for them to quieten their minds and meditate on God.