Specifications: This is a multifunctional pen and a preview. Gel Ballpoint Pen Lead NJK-0.5 Lead Prefill Product Size: Maximum Diameter φ0.1 x Total Length 3.9 inches (3.0 x 98.2 mm); Product Weight: 0.03 oz (0.7 g); Ink Color: Black; Ink: Water-based pigment; Ball Diameter: 0.02 inches (0.5 mm); Ultra fine; Body: S3A11, S4A11