I've been through 2 of these in 6 months. It's supposed to be polycarbonate (PC) plastic, but it looks like it's polystyrene (PS or HIPS) because the case and clip are broken. PC has 3 times the impact strength of HIPS and is much more expensive than other plastics. I noticed that the shape labels of the current product image do not match the case I bought 6 months ago, they are exactly the same as on the less dollar AlphaCell case. Both claim it's a PC but I doubt it as the Chinese lie a lot about what they do.
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