Plastic Cased Bar Magnets - Set of 10Red and blue plastic covered bar magnets. These magnets are attractive as well as an easy way to teach magnetic attraction and repulsion. The bar magnets feature colour coded poles to easily identify them. Find out which materials are magnetic and which ones are not. Or combine the bar magnets with iron filings to amaze your students! Magnets are used in many appliances and in many every day objects. It is therefore important that students understand