The 4-in-1 drawing tool: draw in circles and straight lines, construct, copy, and read angles, measure in inches and centimeters, and create geometric patterns and designs. Easy to use, just place a finger on the disc, and using pen or pencil in the locating holes in the cursor, draw a circle. 5-3/4 in. long with a 4-1/2 in. measuring scale. Grade 1 and up. WARNING: Choking Hazard. Small Parts. Not for children under 3 yrs.