Package Contents: You receive 4 pieces of dog nail grinder replacement heads, which can be used interchangeably for longer life. Product Material: Our replacement parts are made of solid brass shaft and diamond wheel, the brass shaft has high stability, and the diamond wheel is strong and wear-. Product Advantages: These replacement heads can be cleaned with water after removal, just wipe dry. Provides the best trimming for your dog's nails. The nail grinder replacement head has a solid brass shaft for longer life and greater stability. Nail grinder heads are easy to clean, remove the grinding head from the Nail Grinder and clear and clean. Easy To Use & Install: These dog nail grinder replacement heads are easy to install, just remove the old and insert the new, make sure it is firmly inserted when installing. Colour:Gray Material:diamond Size:21x13mm Package Contents: 4 * Dog Nail Grinder Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.