This is an iPhone 4S case with 2 rotating gears on the backside of the case. It's a nice little addition to your phone, if you want to impress your friends and family. -->How to assemble: 1. Lay case and the 2 gears on a flat surface 2. Inspect any cracks 3. If there's no cracks you can start gently pushing the gears into their sticks.(It does not matter which way you put them they are identical from the bottom and top) 4. Take your iPhone 4S and place it on top of the case and push it gently down. You should hear a "click". And there you have it your very own iPhone 4S case with awesome gears. Hope you enjoy it!