We have 3 brands of nails files. Akzentz white files in pkgs (50). Dannyco various files in bulk or single sleeve in boxes (50) and bulk no name white files in pkg (50). All files are disposable. Wooden core are meant for manicure and pedicure services. The cushion files are preferred for nail extensions. Grit rules are the higher the grit the softer or finer the surface. Natural nail grit is 240 or 180. Gel products need 100 grit and acrylic products need 80 grit. There are dual grit files, straight and wide varieties. Do not clean and use on more than one client. Always season the edges as they can be sharp. Ask our stores for a sample to try.