Sankakkei Star Tetrahedron Seeds #M-size.
Size: ø 12 mm with ø 3 mm holes - The ‘Star Tetrahedron’ seed enables you to build the Tetrahedron, Octahedron, Star Tetrahedron, Vector Equilibrium, Isotropic Vector Matrix and the 64-Tetrahedron Cube or any other structure with tetrahedronal angles and axis.