This item is currently not available in the Guild Wars 2 API and you are seeing the last known version. The item has either been removed from the game or needs to be rediscovered.
Double-click to consume.
Masterwork
Transmutation
This will replace the appearance of one back slot item of any weight class and unlock the skin in your account wardrobe.
"description": "This will replace the appearance of one back slot item of any weight class and unlock the skin in your account wardrobe.
This back slot skin has no stats of its own.",