The Master Helicopter Cube is an edge-turning cube with two layers on each turning axis. This is a flat-cut version of the puzzle I presented back in August 2010, and I have redesigned the mechanism several times since then. This mechanism is very stable, and rarely locks up. To order this puzzle, add it to your cart, check out, and then email me your Order Number. (eitanspuzzleshop@gmail.com) Be sure to specify that you got the "Master Helicopter Cube". You can order the stickers from Oliver Nagy here: http://speedcubing.hu/webshop/index.php?main_page=product_info&cPath=6_41&products_id=334&zenid=88f5f2cbc17170175a2873bf982812b0 You will need twelve 4-40 5/8" or M3 16mm flat-head screws. Copyright 2012 - Eitan Cher