News about the iPhone 6's new sapphire crystal screen is coming thick and fast. On Monday we told you how bendable it's going to be. Today we have a video from YouTube user Marques Brownlee putting the screen through an extreme torture test. He bends it to 90 degrees under his shoe, scores it with a knife, and scratches it with keys. The result: no damage. 

The new "unbreakable" device appears to solve one of the biggest annoyances for iPhone users. 

The glass is "paper thin," Brownlee says, and yet it's nearly indestructible--at least under normal use, like being carried around in your pocket or getting dropped onto the floor from time to time. It's a long way from older iPhone models, where the screen shatters like a windshield in a car crash if it smacks a hard surface. 

Additionally, there's hardly any color distortion when you look at the iPhone 6 screen. This means the picture comes in crystal clear--to the point where you could probably see individual hairs on a dog.

There is only one potential competitive disadvantage: The glass in the video is for a 4.7-inch screen, not a big phablet-sized 5.5-inch screen, like Samsung's Galaxy S5 or Note 3 flagships. So far, we've seen lots of leaked photos and spare parts from the smaller of the two rumored new iPhone 6 models, but much less from the larger format. Apple will need a larger screen to stay competitive with other smartphone makers. 

Here are some details from Brownlee's iPhone 6 torture test.


First note how clear the screen is. There is no color distortion when you look through it:


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"This thing is paper thin, literally as thin as a sheet of paper," Brownlee says.


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You can bend it a little bit, like this. That's way beyond the flexibility required from normal use. But hold on one second ...


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Even if you try to snap it at 90 degrees is stays in one piece.


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"I dragged the point of the knife around the surface with some serious pressure and again I got no results," Brownlee says.


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"There is absolutely no way I can break this display."


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"The worst blemish on the surface was actually my fingerprint marks," Brownlee concludes.

"I think this is what they're going to make a big deal about" when the iPhone 6 is launched, Brownlee believes.

Here's Brownlee's full video. He thanks Sonny Dickson, another Apple video blogger, for the parts.

 -This story first appeared on Business Insider.