Erasable ink. Technologically advanced erasable ink. Writes like a ball point pen yet erases like a pencil (Ink becomes permanent over time - not recommended for official documents). Ink is pressurized to write at any angle. Guarantee: If your product does not perform properly, please return for replacement: In the United States, return to: Sanford, L.P., 2707 Butterfield Road, Oak Brook, Illinois 60523, Attn: Consumer Affairs. In Canada return to: Sanford Canada, 2670 Plymouth Drive, Oakville, ON L6H 5R6, Attn: Consumer Affairs. www.papermate.com. www.sanford.com. Assembled in Mexico.