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 Ashley Smart Tak, pins, tacks, staples, etc. The surface is designed for dry erase and water based markers and washable crayons. Chart measures 17″ x 22″ with a dry-erase, glossy surface, 0.45mm thick.