The PyraStar is a simple 2x2x2 variation with tetrahedrons instead of cubic pieces attached. Mèffert produced the PyraStar in 2009. The internal mechanism was improved a little bit by adding some small balls to the inner mechanism, which gives the puzzle its typical Mèffert click as known from the Skewb. The pieces can be moved into place quite well. Also the puzzle comes already lubed to improve the handling.
Size: height 7cm; edge across the puzzle 9.6cm, piece inner edges 5cm, edge length from center to vertex: 4.8cm (because the vertices are rounded a little bit more).