These are sanding discs, which are made of materials, durable and can be used for a long time. Great for foot , and it will not hurt your foot. Come and bring one home! Features -Color: Black -Material: Carborundum -Size: 4.30X4.30X0.10cm/1.69X1.69X0.04in - The disposable design is compatible with many other brands of electric foot grinders on the market. - In selected materials, the roughness is better, which can effectively remove dead skin on the feet. - Comfortable experience, our product adopts a curved grinding head design, which can quickly clean the hard skin on the heel. - Easy to install: easy to install, just press, take out the old grinding head, and press to press the new grinding head to the body. - The simple installation method is suitable for people of all ages, you can share with your family or friends These grinding heads. Package list: 240 x Grinding accessories