18 months & up. Introduce light and color exploration, along with early STEM skills, through the organic and layered builds of Grippies® Windows. Over-molded metal ball connectors join colorful, secured magnetic panels to create 2D and 3D builds. Tactile grips and over-molded plastic are soft and easy for little hands to hold. Watch your young builder discover magnetic principles, properties of light, and color recognition through multiple building and patterning activities. Compatible with other Grippies® sets.