Sturdy, optically clear plastic sheets No need to mount-lie flat on projector stage Not for use in copiers or transparency makers Size: 8 1/2 x 11 100 sheets/box Box of 100 Sheets. Can be written on, wiped clean and reused multiple times. Compatible with most dry and wet erase markers. Great for stacking multiple graphs to show changes over time. Ideal for last minute slides and presentations.