Numbered 1 to 100 on one side, with a blank 10 x 10 grid on the other side, these durable boards are printed on heavy-duty card stock, then laminated for long-term classroom use. Use them with Hundred Number Tiles or Ideal's Wipe-Off Pens, both sold separately. Set of 10, each 10 1/2'' x 11'' (26.5 x 28cm)..