OPI Leveler Phat File - Single Pack by OPI. OPI Phat File Leveler removes imperfections from artificial nail surfaces. Professional use only. Gentle on cuticles but big on professional results. Featuring a unique OPI ergonomic design and flexible foam construction for easy use and professional performance. Long-lasting and washable, Phat Files are idea for both pro use and retail sale. Single pack, 250 grit.