Apple has updated the design of their MagSafe Connector for the new MacBook Pros (15, 17inch).
The new connector uses an aluminum tip instead of the plastic one which used for the 13-inch MacBook Pro and MacBook power adapters. Its new design is more streamlined and likely more resistant to stress. It's similar to the one used for the MacBook Air.
You can see the different connectors in the image below
The new connector uses an aluminum tip instead of the plastic one which used for the 13-inch MacBook Pro and MacBook power adapters. Its new design is more streamlined and likely more resistant to stress. It's similar to the one used for the MacBook Air.
You can see the different connectors in the image below