Magnetic Stick N Stack Mega Stablizer Building Plates, 12 Pc Set, 4 Board Sizes Powerful Magnetic Building Plates Include: Two-12x12, Four- 12x3, Two-6x6, Four- 6x3 Start any structure with the right foundation - Add these magnetic building plates stabilize your structure Each tile has rivets and lattice to strengthen the quality of the tiles Creates bridges, tunnels, building structures and much more Top Quality- Safety Tested - Compatible with all other brands Fun Cognitive Development Hands-On Geometry Skills Spatial Skill Growth Fine Motor Development Encourage Critical Thinking Boost Math &amp; Creative Skills