Photoshop Brushes usually available in huge size files. This is because some designer made high resolution brushes to get high quality for Printing Standard. The size of each brush can be range between 1500px – 2500px. You can imagine if a series of certain theme brush being compiled together in one file. I’m not talking about hundreds of kilobytes, be patient to download more than 10 megabytes .ABR file in archive folder.
Photoshop Brushes by default, saved in a specific file known as: .ABR file format.