The next iPhone will use stronger materials than the iPhone 6 an will be less likely to bend, Pocket Lint reports.

YouTube users going by the name of Unbox Therapy have reportedly gotten their hands on the rear plate of the iPhone 6S and are putting it through the bend test.

Unbox Therapy's goal was to see how difficult it was to bend the materials used in the new iPhone 6S. The iPhone 6 Plus was criticized for easily bending when put in users' pockets. iPhone fans have hoped that the iPhone 6S would use a stronger aluminum, perhaps the same aluminum used in the new Apple Watch.

The iPhone 6 used 6063 aluminum, which is not the strongest metal out there, compared to other metals available. The new metal used in the iPhone 6S has a much thicker anodization layer than the iPhone 6. Unbox Therapy even was found to be having trouble sanding off this layer to find out which metal type is being used.

The results found by the YouTube users was that the iPhone 6S is using a much stronger metal than the 6303 aluminum. They found that there is more zinc content, which means the metal is the 7000 aluminum, a much stronger and more expensive metal.

Testing the 6303 aluminum used for the iPhone 6, the rear plate started bending at 30 pounds of weight. It was totally bent at 35 pounds of weight.

The rear plate with the 7000 aluminum made it to 80 pounds of force without bending. In contrast, the entire iPhone 6, not just the rear plate, started bending at 70 pounds of force.

A stronger metal could push the price of the iPhone 6S up, but no pricing information has been made available on the device yet.

Watch the video of the bend test below: