Nice job on keeping the set featured around a common theme, red and black. I like those busy and working animations as well, it's cool how the circles seem to shrink into disappearance. Here are a few tips that will help I hope. 
1. I think the resize and move cursors would probably look better if they were a little larger.
2. Maybe try using the text tool to make the question mark for the "help select" cursor. If you did, maybe choose a different font instead. A slimmer font might look better.
3. I would make the "unavailable" cursor thinner. The theme has a slimmer look to it, so that and the question mark's thicker appearance make them fit in a little less.
4. The hotspots for the "vertical resize" and "move" cursors are not placed correctly.
Many, many thanks to you for associating them with the correct cursor types as well when you uploaded them! So many people do not and it renders the change cursor tool useless...
It's a simple set, but it's very functional, and the aesthetics are pretty good. Keep up the good work! 
:-D 
