• Erasable ink pen by friction. • Does not smudge the paper and leaves no residue. • Allows writing and erasing as many times as necessary. • 0.7 mm ballpoint tip and 0.4 mm line width. • Grip reduces writing fatigue. • To erase, rub with the built-in silicone ball. • The silicone ball does not wear out. • Not recommended for official documents or exams. • Avoid extreme temperatures (-20ºC to +60ºC). • Product dimensions: 3 cm wide, 21 cm high, 11 cm long. • Product weight: 0.01 kg. • Content: A blister pack of 4 units.