Meffert's Hollow Cube
Hollow Cube is the newest technical innovation in twisty puzzles. With no core inside and revealing how the segments move, this cube is surprisingly unique. Beautiful design but no less difficult than a normal cube.
Twist and turn to scramble the colors, then try to make one solid color per face.
Measures: about 2.5 x 2.5 x 2.5 inches.