These Learning Can Be Fun Linking Cubes have been designed to be unbreakable for a durable learning tool in the classroom or at home. They can be joined together allowing you to create for hours on end. They're perfect for use at home or in the classroom. They are great for enhancing hand eye coordination skills. The cubes come packaged in a PET jar for easy storage. Each piece measures 2 cm. The pack contains 100 cubes, in 10 assorted colours. It is recommended for ages 3 and up.