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 13" x 19" with a dry-erase, glossy surface, .45mm. The place value Chart allow you to practice writing place value in various ways.