Smart Poly™ material has been designed for charts in the classroom and home. These charts are strong, durable, water resistant, and do not need lamination. They can be displayed like any chart with hooks (grommet), Ashley Smart Tak™, pins, tacks, staples, etc. The surface is designed for dry erase and water based markers and washable crayons. Chart measures 13" x 19" with a dry-erase, glossy surface, .45mm. This set of 6 charts includes: Calendar (91053), Incentive with Grommet (91054), Class Schedule with Grommet (91055), Classroom Rules with Grommet (91056), Blank with Grommet (91057) and Birthdays with Grommet (91058).