Wide variety of brushes, different bristles hardness & sizes for different tasks all the time.
The round handle brushes clean those finer detail, made for hard-to-reach places such as CPU fan, controller, camera, sewing machine
The flat handle brush is used for cleaning PCB, circuit boards and electronic components. The crank brush is good for some heavy-duty scrubbing such as grout
Note: The yellow bristles brush and scraper brush are not anti-static, the scraper brush can clean some extremely difficult stains, shaver head, and car air vent
This computer cleaning kit gets rid of the dust bunnies and crumbs on your keyboard, goes well with an air blower or compressed air or power duster