Nail Files and Buffers - Professional Nail Buffer Block for Shaping Polishing, New Natural Nail Polisher with 4 Sides for Nail Art Gel Suit for Home Salons Use (2 Pcs)

Is this what you mean? I bought this one (pack of two) a year or so ago. https://www.amazon.com/Nail-Files-Buffers-Professional-Polishing/dp/B07RT36R4P/ref=mp_s_a_1_1_sspa?crid=B82K937FXDB2&dib=eyJ2IjoiMSJ9.Q25x-_IJ0ZBvVbd6KRp7WL6_eJrFfDQegZwoYcyw1ek5FVt76f78pD4_fX6KHZxqk-fHlD18mtGNQ-FbwVzauBaqetqOXU_sY9UBBys6p-IxF5Ald4p46edlhbQPQmkxzHqx10WY17Ug_W2OwBnS7EQUBRIOvr6ynfwchkiLdpwZ6EdTzWmyHzecz7nJbao3l2cahpz7eC_ehTMYbwtvYw.3J5NPtMncGVoLqwTx8FSgUQmP1c2Drp90m6sUqLH_UU&dib_tag=se&keywords=keiby+citom+nail+buffer&qid=1781835473&sprefix=keiby+citom+nail+%2Caps%2C120&sr=8-1-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9waG9uZV9zZWFyY2hfYXRm&psc=1

best if you have the nail buffer and polish, the one with one side that is smooth like these https://www.amazon.com/Nail-Files-Buffers-Professional-Polishing/dp/B07RT36R4P those are better for your pen as it's smooth. but I use the rough nail file when I'm in a pinch (but use sparingly)!