Opaque White. You can draw circles, triangles and straight lines with this unique 4-in-1 drawing compass/ ruler. To use the compass, pinch and slide the cursor to the desired position and lock it, place your fingers on the transparent swivel disk, place your pencil point in one of the two cursor holes and draw a circle. Inch markings to 4.3" (11 cm). Available in solid opaque white or transparent.