Clouds is an element that from time to time we can generate in a design, so the fact of having 25 brushes to help us in that task can be definitive when it comes to saving a very succulent time.
The brushes are in .abr format and should be compatible with your Photoshop, unless it is a very old version that does not support brushes of this type.
In short, to say that I see them as mandatory for anyone's collection, since there are many brushes for example of lights or smoke, but high resolution clouds are scarce, and even more so if they are of quality.
Source | Color Burned
Download | Brushes