Product Description This set of 10 mini, compact compasses is great for observing lines of magnetic force. Use in physical science classroom to demonstrate how a compass works and to study polarities and magnetic fields. Each little compass has a magnetic north compass point with directions indicated, and each has a hard plastic body with black base and white markings for clear visibility. Compass measures approximately 1.5 cm (15mm) diameter and 5mm tall. Educational quality. Pack of 10. Age 7 and up.