Uni-ball Signo Style Fit Refill Cartridge 0.5mm (UMR-109-05)

Ink Color Red, Pink, Baby Pink, Rose Pink, Mandarin Orange, Golden Yellow, Orange, Lime Green, Green, Light Blue, Sky Blue, Blue, Blue Black, Violet, Brown Black, Black Ink Composition Pigment-Based Diameter - Max 3.2 mm Ink Characteristics Acid-Free, Archival Quality, Fade-Resistant Size - Length 9.9 cm Tip Material Metal Tip Size 0.5 mm Tip Type Conical Water-Resistant Uni-ball Signo Style Fit Refill Cartridge 0.5mm allows you the freedom of choice to create a writing instrument that is unique. You can customize what type of refills you want, the pen body and ink colors that you want, as well as the number of writing instruments you want to have (different sized bodies that can hold 1, 3, or 5 writing instruments). The system is eco-friendly since you can refill it again and again.