Make measurement activities more manageable for younger students with our Primary Ruler. We've left off the lead-in space on either end so students can measure more accurately. One side features whole inches and half inches, while the other side features quarter inches and centimeters—four rulers in one! Flexible material enables students to measure arcs and circles, too. Ruler measures 12"/30 cm. Kit includes 30 Primary SAFE-T® Rulers, overhead transparencies and Teaching Guide.