There are 216 pieces of magnetic spheres in one set Suitable for children above 8 years old Size: 3 to 10mm Magnetic fields of magnetic balls are concentrated more at poles than disc or block magnets Balls are great for experimentation and magic tricks, are just plain fascinating to play with Consists of hundreds of individual strong neodymium balls Can create huge number of shapes and models according to imagination by this amazing QQMAG (neocube) Suitable for experiments and combining with other magnets