Specifications: This is a refill for dry smoothness that does not get dirty, even if you write it right away. Ultra Fast Dry Gel Ink JLV0.5 Product Size: Maximum diameter φ2.4 x Total length 4.4 inches (6.1 x 11.1 mm); Weight: 0.08 oz (2.6 g); Ink color: Black; Ink: Dry gel ink, water-based dye.