This KOIZFF 12-pack replacement roller heads is specially designed for Amop electronic foot files, tailored to meet different foot care needs with a dual-grit combination: 6 extra-coarse rollers and 6 regular-coarse rollers. Exclusively compatible with the Amop (Black + Blue) model, these refill heads boast a durable, high-quality abrasive surface that effectively buffs away tough calluses, hard skin, and rough patches on heels and feet, leaving your skin smooth and soft. The installation is quick and tool-free—simply remove the old roller head and snap the new one into place for instant use. Perfect for both at-home pedicure routines and professional foot care sessions, this 12-pack provides a long-lasting supply, saving you the hassle of frequent re-purchases. For optimal results, we recommend replacing the roller head when the abrasive surface shows signs of wear, ensuring consistent and efficient foot-smoothing performance every time.