Grimm's Medium Octagon Form Building Set - Wooden Mosaic Block Puzzle, 32 Triangles Thick, 8-inch diameter octagon frame holds 32 equal triangles in 8 vibrant colors. Handmade in Germany from solid wood, it's both a puzzle and a building blocks set. Finished only with certified non-toxic, water-based stains and food-grade oil. No varnish or lacquer. Create mosaic designs inside the frame or build 3-dimensional structures with the blocks. Each triangle block is 4 cm thick, so this Medium Octagon set is compatible with other 4x4 Building Sets from Grimm's.