Pentel Refill Ink for EnerGel Liquid Gel Pen, 0.5mm, Needle Tip, Red Ink, Box of 12 (LRN5-B-12) Go to amazon.com Related posts How to find the best b12 vape pen for 2022? FeatureRefill for EnerGel Liquid Gel Pen (BLN75)Quick-drying, super-smooth ink0.5mm, metal tip writes medium linesRed Ink12 refills per box DescriptionRefill for Energel (BLN75, BLN105, BLN115), 0.55mm, Red Ink, Box of 12.