Pen refiller cartridges, made of plastic material, with a round-shaped metal lead, with a line width of 0.7 mm, in blue color. The ink has no ingredients that can be harmful or toxic for the skin and it can be easily erased with an eraser, leaving no marks on the sheet of paper during use. This product is suitable for use with the Carioca Oops pen with eraser, in blue color (code 782162).