Magic Ring is a circular plastic teaching aid designed to help students understand important concepts related to circles. It has an outer diameter of 25 cm and an inner diameter of 20 cm, with evenly spaced holes for geometric constructions. This manipulative can be placed on a drawing sheet or whiteboard to explore properties of circles, cyclic quadrilaterals, and angle relationships, such as opposite angles in a cyclic quadrilateral, angles in a semicircle being a right angle, and angles in the same segment being equal.