Earlier this month, a video was released that claimed to show the 4.7-inch iPhone 6 front panel being subjected to several stress tests, including scratching with a knife and bending. The video was a win-win for mobile fans because it gave iOS users a peek at what may be an iPhone 6 component, while iOS haters got to see an Apple part getting worked over. Luckily for both camps, more iPhone 6 part abuse has made its way online.

YouTuber Marques Brownlee has posted a second video that explains the science behind why his knife couldn’t scratch the iPhone 6’s sapphire display and also puts it to another type of scratch test. This time around, Brownlee takes two types of sandpaper to both the iPhone 5s’s Gorilla Glass screen and the iPhone 6’s sapphire panel.

So how do they fare? The sandpaper does a much better job of scratching both front panels than the knife did, though the iPhone 6’s sapphire part withstands the scratching better than the iPhone 5s’s Gorilla Glass component.

Later in the video, we see the same iPhone 6 front panel being taped to a wall and shot with an arrow by comedian Joe Rogan. While the iPhone 6’s sapphire panel stood up fairly well in its meeting with a piece of sandpaper, the same can’t be said for it’s battle with an arrow.

We won’t know for sure if the front panel that stars in this video does indeed belong to the iPhone 6 until Apple introduces the device later this year. If it is the iPhone 6’s front panel, though, the part ought to be able to withstand living in your pocket with keys, coins and most other objects without taking much of a beating.

Via MKBHD (YouTube)