620 parts 15 shapes 19 hardwood Mini Unit Bricks BPA-free Organic paints and dyes Solid hardwood 100% earth-friendly Recommended Age: 6+ STEM.ORG Authenticated The latest in dynamic modeling systems, our NEW Mini Unit Beams Bridge Builder set provides a rich and rewarding STEM environment. With no additional tools required, budding engineers are ready and able to create, develop, re-work, and marvel at their creations. Each set includes 620 precision-molded Mini Unit Beams in 15 different shapes; 19 hardwood Mini Unit Bricks. For ages 6 and above Based on Pratt scale standard unit blocks Compatible with Mini Unit Bricks and Mini Unit Rocks Multi-sensory and tactile Encourages explorative and open-ended play Introduces mathematic foundations, logic and problem-solving Great for hand-eye coordination, fine motor skills, and balance building