This puzzle is the result of putting internal gears in a master pentultimate, making opposite sides turn in opposite directions for all turns. This puzzle measures approximately 40mm to an edge. To order this puzzle, you must order it in three parts. Part 1: http://www.shapeways.com/model/729226/geary_master_pentultimate_part_1.html Part 2: http://www.shapeways.com/model/755022/geary_master_pentultimate_part_2.html Part 3: http://www.shapeways.com/model/754976/geary_master_pentultimate_part_3.html Additionally, assembling this puzzle requires 72 #4-40 x 3/8” screws, and super glue if you want to glue the caps in place. M3 screws of a similar length are likely to work as well. I can supply you with screws if you are unable to find ones that fit. Contact me if you are interested in a fully assembled, stickered, and dyed version of this puzzle. I have a sticker template available if you’d like to cut stickers yourself, but I can also cut you stickers for a small fee. For more information, see the thread on the Twistypuzzle forum: http://twistypuzzles.com/forum/viewtopic.php?f=15&t=24659