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 don not need lamination. They can be displayed like any chart with staples, pins, etc. The surface is designed for dry erase and water based markers. Each pack includes 4 assorted French charts. Charts measure 17" x 22" and feature a dry-erase, glossy surface. 0.45mm.