These economical ceramic magnets work well for teaching about magnetic poles, attraction and repulsion, and many experiments that call for bar magnets. Ideal for activities that do not require a lot of lifting power. These magnets are not designed to be holding magnets. Ceramic magnets are brittle (like a coffee mug!) and may chip or break if dropped. Each bar measures 1.13"L x .34"W x 0.25"T. For ages 8+. Each pack includes 100 red ceramic bar magnets with ends stamped to indicate poles North (N) and South (S).