What are the dimensions of each block? They're 1.38 inch (3.5cm). Larger size than other brands, more suitable for toddlers to hold and prevent swallowing. Are all six sides magnetic? Yes, the 6 sides of this magnetic blocks are all magnetic, can stick the metal doors, refrigerators, magnetic drawing boards, and so on. How many blocks in the package? A total of 48 magnetic cubes, and it also comes with a storage bag and an idea booklet. Are these good for an autistic child? Yes, this magnetic block serves all kids. It makes a rustling sound when shaken, making it ideal as a sensory toy, autism toy, or Montessori toy. What's the recommended age for it? Is it good as toys for 3 year old boys girls? This toddler toys for 2 3 4 5 6+ year old boys girls. It has a large size, rounded corners, and ultrasonic sealing with built-in magnets, giving children a safe entertainment environment.