The phrase "are unique features" is correct and usable in written English.
It can be used to describe characteristics or attributes that are distinct or different from others.
Example: "The new smartphone model boasts several features that are unique features in the market, setting it apart from its competitors."
Alternatives: "are distinctive traits" or "are special characteristics".
As far as I know those are unique features".
Some who study smaller-scale evolution within species, called microevolutionists, reject Dr. Gould's arguments that there are unique features to large-scale evolution, or macroevolution.
Establishing interactive relationships among transport networks, costs and benefits are unique features of the methodology designed for developed areas.
These cliffs, made up of tough volcanic basalt rock, also known as traprock, say local historians, biologists and geologists, are unique features of the Connecticut landscape, something that cannot be found anywhere else in the world.
Multiple interconnected basins through gates installed in the check banks and backflow at the inlet end are unique features of contour basin layouts used in southeast Australia.
Simultaneous, accurate quantification of major to ultra-trace element concentrations from Li to U by well-controlled ablation of the entire fluid or melt inclusion content and successful use of largely matrix-independent external calibration protocols are unique features of this method.
There's unique features in mobile that we can increasingly think about.
The film's fast-paced montages and jump-cuts were unique features in American cinema at the time.
However, some of the score components might still be unique features of the epidemiology at AHMC.
We believe this to be unique feature of Stanford as compared to other top academic Neurology training programs.
The layout of St. Andrews is unique, featuring many distinctive characteristics -- deep pot bunkers, enormous double greens, wide and fast fairways and blind tee shots.
