Guidecraft Classroom unit blocks are great educative tools to enhance the imaginative power of young minds. Made of well sanded rubber wood, they are splinter free and safe to use. These European quality classroom accessories are perfect for enhancing the imaginative and cognitive skills in kids. They aid in learning spatial relationships and shape formations. This particular set has 45 blocks within it. The set of building blocks is delivered with an informational activity manual that helps in getting started. These are durable and resistant to dents and dings. This cost effective set has suggested age range of 02-07 as per the manufacturer