Montessori Constructive Triangles Curriculum: Standard complete Constructive Triangles set with five independent wooden storage boxes, core Montessori sensorial & geometry teaching material. Different sized colored triangles can combine into regular shapes including hexagon, pentagon, rhombus, parallelogram and equilateral triangle Vivid Color-Coded Triangle Classification Design: Bright color grouping (Red/Yellow/Blue/Green/Grey) helps kids classify triangles by side length, angle and shape. Black dividing lines on each piece mark equal segments, intuitively guide children explore how multiple small triangles compose large regular polygons Premium Solid Beech Wood: All shape pieces and storage boxes are made of natural solid beech hardwood; every edge manually sanded smooth without burrs. Non-toxic water-based matte paint, scratch-resistant and fade-proof Boost Geometry Cognition: Kids freely split and assemble triangular pieces to discover plane composition rules, develop shape recognition, visual discrimination, spatial imagination and pre-math geometry awareness, lay solid foundation for future elementary math learning Essential Classroom & Gift Choice: Must-have supplies for Montessori preschool sensorial shelf and homeschool STEM learning station; separate wooden box design for tidy classified storage. Ideal birthday