This magnetic building tiles made of food grade ABS plastic and strong magnet. Smooth surface, round edge design won't scratch or hurt hands. Bigger sized magnets to get stronger magnetism easier to build stronger and larger projects . New designed lines to avoid scratches keeping long-term bright color and smooth surface. 
Good to develop kid's variety of abilities such as Dynamic, Research, Artistic, Mathematical, Visual, Interpersonal,…etc. Perfect preschool toys.