The Reading Analysis 2nd set is used for the basic analysis of sentence structure, focusing on the flow of noun -> verb -> adverb. It includes a control chart measuring 40 cm (about 16") square, as well as wooden arrows and circles which relate to the figures on the chart (9 orange arrows, 3 black arrows, 1 red circle, 1 orange circle, and 3 black circles of varying size), which are contained in a small wooden box with a lid.  Makes a great companion to the Reading Analysis 1st Set.