Welcome to NSI Australia!
The Endurance Buffer 180/240 is great to PREP and shape the natural nails.
The bridge side is a blessing for getting close to the skin, sidewalls and cuticle line.
You can use your old files and old buffers to clean and remove the excess of polishes or gel polishes. It really works like an eraser on the excess or colours , when you run the file of buffer and slide it along the nail in a perfect straight line and direction. No fiber = No mess!