1Polishing head is made of ceramic material, which has good polishing effect and won't damage the workpiece. 2It is an efficient polishing tool for surface polishing in small area. 3Low abrasion, long service life. 4With good grinding performance and low grinding heat. 5Can be used in combination with pneumatic or electric rotary tools. Features: 1.Polishing head is made of ceramic material, which has good polishing effect and won't damage the workpiece. 2.It is an efficient polishing tool for surface polishing in small area. 3.Low abrasion, long service life. 4.With good grinding performance and low grinding heat. 5.Can be used in combination with pneumatic or electric rotary tools. Specification: Material: Ceramic, Metal Shape: Cylindrical Quantity: 50pcs Grinding head size: 3*3mm, 3*4mm, 3*5mm, 3*6mm, 3*8mm, 3*10mm, 3*12mm (Optional) Package weight: Approx. 100-295g / 3.5-10.4oz Package List: 50 * Grinding Head