Hull completely invisible once on the laptop, and seems very solid! Moreover it is extremely thin! Frankly, a purchase that I do not regret! Only default, there is no opening to change the SIM card (the same time I do not think it changes everyday SIM card) or opening for the Micro SD card, but Once inserted not need to open every day. I was ordering a Thursday and on Monday received after then, very quickly! I recommend it to all those with a Z1 XPERIA!