This is the Disk II Limited Edition Puzzle Box by Kagen Sound. This is #20/21 pieces that were crafted! Kagen describes this puzzle as "Y ou must rotate intersecting discs on the top of this box to create a checkered triangular pattern. In each version of the Disc Box there is an array of discs fixed to the top of the box. Each disc has a number of gaps carved out of it, like a bite from an apple. Aligning any gap to a neighboring disc will unblock it and then you are free to rotate it too." An amazing piece but difficult to solve! Arrives with instructional manual and COA.