26. What's the material for the BTR5 2021?

The BTR5 2021's middle frame is made of aluminum alloy, with a 6H hardness 2.5D tempered glass on both the front and back panel (scratch resistance is the same as that of iPhone's), which is not easy to scratch in use. But please don't put it together with sharp metal objects like keys. Besides, the back clip is made of ABS (Acrylonitrile Butadiene Styrene).