These roller refill are made from abrasive material and fit for standard callus remover, working with remover as smoothly as one. All of the coarse surface is effectively controlled within the range that will never hurt skin or tissue. Color: pink Material: plastic Size: 6x2.5x2.5cm. Compatible with standard electric callus remover, easy to install and replace. callouses removed and skin moisturized is imperative to prevent cracks that would be hard to heal. Ergonomics design, never hurt skin or tissue. Remove and callus effectively and quickly. Package Contents: 5* Foot File Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.