These disks have hundreds of small holes at the intersection of concentric circles and radial line allowing the user to mark right through the disk. The holes are large enough for either a pin tool, pencil, or pen tip to fit through. Sold in sets of two with odd and even sheets.

Each disk has a series of concentric circles divided by colored radial lines.  At the intersection of the circles and radial lines are small holes that allow the user to mark right through the disk.