I use the 116 brush. I originally bought this as a blush brush, but I found it works better for StudioFix and other face powders.
I've been using it to apply Avant Gold MSF over StudioFix on my nose, cheeks, and forehead and I find it's also excellent for this purpose.
The compact brush hairs pick up just enough product for a medium application of StudioFix.
I use the sponge around my nostrils and eyes for slightly fuller coverage in those areas.