This affordable magnet set includes 9 ceramic magnets for fun scientific experiments. Included: one horseshoe red/blue magnet: 28 x 28 x 4 mm two ring magnets: 30 mm outer ring, 12 mm inner ring, 4 mm thick one large disc magnet: 18 mm diameter x 3 mm thick two medium disc magnets: 15 mm diameter x 3 mm thick two small disc magnets: 9 mm diameter x 3 mm thick one bar magnet: 20 x 9 x 3 mm Please note that ceramic magnets are very delicate and will break if dropped. They are also the weakest of all magnets and are mostly only used for lifting very light objects such as iron fillings and paper clips or deflecting a compass needle.