color 1

color2

color3

color 4

Size: Rectangular 26 * 9.5 * 3cm; dichotomy grid 30 * 15 * 2cm
Third of the grid 30 * 15 * 2cm; quartile grid 25 * 25 * 2cm

Weight: rectangle about 190g; bipartite lattice 340g;
Thirds grid 300g; 390g four cell