The Didax Unifix® Cubes Interlocking Counting Cubes with Activity Booklet Set of 100 is a plastic toy designed for mathematics learning in children. With 100 cubes included in the set, kids can engage in manual counting activities and develop their math skills. The interlocking feature of the cubes adds an element of fun and creativity to the toy. The set is branded by Didax and is suitable for children aged 36 months and above, making it a great educational tool for young learners in the target audience.