175 parts 15 shapes BPA-free Organic paints and dyes 100% earth-friendly Recommended Age: 6+ STEM.ORG Authenticated Unit Bricks has stepped beyond blocks to equip children with the tools they need to build the world they want. The latest in dynamic modeling systems, the Mini Unit Beams Crane Builder set provides a rich and rewarding STEM environment: Encourages explorative and open-ended play Introduces mathematic foundations, logic and problem-solving Great for hand-eye coordination, fine motor skills, and balance building With no additional tools required, budding engineers are ready and able to create, develop, re-work, and marvel at their creations. Each set includes 175 precision-molded Mini Unit Beams in 15 different shapes; 3 hardwood Mini Unit Bricks. Based on Pratt scale standard unit blocks Compatible with Mini Unit Bricks and Mini Unit Rocks Built-in storage case made from eco-friendly cardboard with picture examples of buildable structures All-natural organic paints and dyes Unit Beams are made from BPA-free injection molded plastic Unit Blocks are made from solid hardwood; 100% earth-friendly All Unit Bricks products conform to major international safety requirements for toys (ASTM, CPSIA, EN71) Designed in Hong Kong and the USA