It's laser engraved on bamboo, I really don't suggest you to buy it. The bamboo is very likely to craze. If you are looking for a unique nice and endurable case I suggest something like this: http://www.siliconray.com/laser-engrave-photo-metal-iphone-4-4s-case.html
It's laser engraved on oxided aluminum, I think at least it should be more durable than any other printing technology