Children Explore basic mathematic principles by sorting, classifying, comparing quantities and discovering shapes and patterns (set includes 180 magnetic foam shapes and 4 magnetic boards; enough pieces for 4 children to use at the same time; shapes included are the same as those found in most attribute block sets, but with 6 non-traditional attribute colours; boards are 12"W x 9"H; square foam shapes are 1"sq. ; triangle foam shapes are 1"W x 1"H; trapezoid foam shapes are 1-2/3"W x 1"H; hexagon foam shapes are 1-1/3"W x 1-1/2"H; rhombus foam shapes are 3/5"W x 1-1/3"H; diamond foam shapes are 1"W x 1-1/2"H) - discount school supply item.