MathMechs Extensor(TM) Starter Set
$19.95
An extensor is an extending beam based on a scissorlike mechanism. Extensors can be connected together at nodes to build larger expanding structures. Extensors with central "Y" shaped parts have three arms in each stage, while those with "X" shaped parts have four. These build structures with different angles and geometries. The starter set contains 40 plastic parts, two springs, and a color instruction booklet. Ages 13 and up.

ITSPHUN Geometric Construction Set
$29.95
This easytouse set contains 36 triangular pieces, 36 square pieces, 12 pentagonal pieces, and 20 hexagonal pieces, along with 27 cards containing 54 model ideas. Ages 5 and up.

PolyPuzzle Kepler Star
$9.95
With 68 rhombusshaped puzzle pieces at your disposal, the creative part is up to you. A number of geometric shapes are possible, including the dodecahedron and the Great Dodecahedron. Ages 8 and up.

PolyPuzzle GeoKit 2
$10.95
This kit makes spherical forms of the tetrahedron, octahedron and icosahedron. It also has triangles to make regular models of the tetrahedron, octahedron and the icosahedron. Ages 8 and up.

PolyPuzzle GeoKit 5
$11.95
This kit contains 120 rhombi and will form a rhombic enneacontahedron and the the pentakis dodecahedron. Ages 12 and up.

PolyPuzzle GeoKit 6
$10.95
In this kit, pentagons and truncated hexagons are combined to make a spherical truncated icosahedron. You can also use 30 folded rhombuses with an acute angle of 61° to make a triakis icosahedron. Ages 10 and up.

PolyPuzzle GeoKit 10
$13.95
This kit contains 144 Golden rhombi, for which the diagonals are in the Golden Ratio. Ages 12 and up.

PolyPuzzle GeoKit 11
$17.95
In this kit a special feature of the hexagons is used to fold along a curved edge to make the dimpled dodecahedron with circular faces. Hexagons are combined with triangles to make a large tetrahedron. The rhombuses make a great dodecahedron  also called the Kepler Star  and there are still enough pieces left to make a cuboctahedron and a dimpled tetrahedron. Ages 12 and up.

PolyPuzzle GeoKit 12
$11.95
This kit makes stellated forms, the great dodecahedron and small dodecahedron. You can also use the pieces to make a stellated tetrahedron, octahedron or combine all the stellated parts to make a stellated icosidodecahedron. Ages 12 and up.

PolyPuzzle Spheres Kit
$17.95
This kit's 126 pieces, in six unique puzzle shapes, let you create a variety of geometric shapes. In the photo with the package, the large shape is a spherical form of the 'great rhombicosidodecahedron', while the smaller image is a 'spherical great rhombicuboctahedron'. Ages 8 and up.
