■ A4 size with a thickness of about 0.26 mm, black cardstock (Y-eye) for business cards and card making. They can be used for other purposes than laser & inkjet printing, brushes, pens and bankers, but the paper is black so it is almost invisible in printing. Print is limited to operational ink. Rather you can use it for writing pens with gold and silver or fluorescent ink, handkerchief, or foil stamping. You can use the black paper as it is, and you can use it as a card or other item. Its hard to use, but we are very demanding paper. ■Business cards, shop cards, price cards, name tags, etc. ■Base Color: Black (black) ■Specifications: Quality Color: Super thick... The thickest paper with high quality. ■Size: A4 size (8.3 x 11.7 inches (210 x 297 mm) ■ Paper thickness: approx. 0.26 mm ■ Compatible with: inkjet, laser printer, heat transfer, etc. You can print it, but the ground color is pure black, so it is almost invisible We recommend using this product outside of printing such as handwriting. ■Number of sheets: 10