1.What's the material used to make the BTR5?

The BTR5's middle frame is made of aluminum alloy, with 2.5D tempered glass on the front and back, in addition to the hardness of 6H (with the scratch resistance of iphone's touch screen), which is not easy to scratch during normal use. Please avoid mixing your BTR5 with sharp metal objects such as keys. Besides, BTR5's back clip is made of ABS material.