The Double 3x3 Cube is made with a black plastic core. The object of this puzzle is to scramble all of the colors and then organize them back to the starting position. This puzzle is extra tricky because it consists of two 3x3 cubes joined together in a row connected along an edge.
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good puzzle that turns very smooth. Siamese cubes are bandaged at the connecting edge so they do require algs in addition to the usual 3x3 ones. The cube twist quality is good, have had no issues with this puzzle.