Smart Poly® Dice Math Smart Wheel with Grommett 13"x19". Write-on/ wipe-off heavy duty washable all poly dice chart, no lamination needed. Turn the wheels to pick a number & fill in the information. No assembly required. Use with dry erase or water based markers and washable crayons. Grommett hole for easy hanging. Use with Ashley Smart Tak®, pins, staples, etc. as an alternative to hang in the classroom. Glossy surface, .45mm.