Finally... a MAGNETIC version of the most popular place value set on the market! Create and manipulate colorful place value charts on your whiteboard. Hand your students the disks for hands-on practice on lap boards too! Essential tool for all math series, especially the popular Asian math programs! Color-coded by place value. Grades 3-6 set includes 140 disks (20 each of 7 places: millions, hundred thousands, ten thousands, thousands, hundreds, tens, and ones) plus 7 headings. Lap boards sold separately (7200000). Disks measure 1"D. Headings measure 6"W x 2"H.