Binomial cube belongs to the Sensory category in the Montessori education system. The cube could help the child exercise motor skills. Develop Fine Motor Skills with Montessori Toys The Binomial cube can receive and properly preserve the three-dimensional geometry, and provide auxiliary functions in the child's operation process, and standardize its operation steps and processes. Made of high quality solid wood, its wooden surface is very smooth, the upper part of the edge of the reinforcement strip, easy to take and place, durable. Montessori Outlet aims to provide premium quality Montessori materials at affordable prices. All our materials are made based on authentic blueprints approved by Mr. Bert Nienhuis (former Nienhuis Montessori CEO) and meet all European and US Toy Safety Standards.