This material from Ashley is called SMART POLY. The material has been designed for charts in the classroom and home. These charts are strong, durable, water proof, and do not need lamination. They can be displayed like any chart with staples, pins, and more. The surface is designed for dry erase and water based markers. Calendar Smart Poly Chart measures 17" x 22" with a dry-erase, glossy surface, .45mm.