EnerGel Liquid Gel Pen Refill - Black Ink (Medium - Needle Tip) by EnerGel® $15.48 SKU LRN7-AI A Product Details: Super-smooth liquid gel ink refill for Pentel retractable and Deluxe EnerGel® pens Writes medium lines with a 0.7mm needle tip Black ink Sold by the box - 12 refills per box