91609 Smart Poly® Dice Smart Wheel® with 2 Wheels & Grommett 13"x19". Write-on/ wipe-off heavy duty washable all poly weather charts, no lamination needed. Turn each wheel to pick a number. Choose a math computation by circling plus, minus, multiply or divide. Write out the equation, visualize and plot it on the number line. 3 pieces, 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.