●When using, turn the holder to the right and pull out the core by about 2 to 3 mm. ●After use, return the core to its original position. ●When replacing the core, pull out the cartridge (this product) from the holder and insert a new product. <How to set> ●Set it in the "Maquillage Eyebrow Holder" (sold separately) and use it. ●Insert the cartridge (this product) into the hole in the holder until you hear a click and set it. ●You can also set tools by removing the included cap. <Effective use> ●The core is shaped like a leaf with sharpened ends of an oval. By using the sharp part, you can draw a neat and thin line at the end of the eyebrow, and by using the wide part, you can draw a thick and soft line that blends naturally with the beginning of the eyebrow. By using different parts according to the part you are drawing, you can create natural and beautiful eyebrows.