You need the 13 skinny rhombs too (preferably in an other color) to have a complete set. The tiles are 2mm thick and their edges have a length of 20mm.
2015-01-06: I've changed the printing arrangement from vertically stacked to side by side since the connecting rod was too fragile. Now the connections need to be cut with a sharp knive.
2016-01-02: With increasing stringency of Shapeways' design guidelines this model became repeatedly unprintable.
All rhombs are now connected to two or more sprongs. Also the sprongs are now 0.8 instead of the minimum 0.7 mm thick. I hope the model will be accepted now. You may check the "print anyway" option. I'm sorry for the inconvenience.