Pentel LR7 0.7mm Refill For Energel  Refill suitable for EnerGel Xm Retractable (BL77, BL77-P & BL77SW) EnerGel XM (BL57) EnerGel Sterling (BL407) EnerGel-X (BL107) 0.7mm tip writes a 0.35mm line. Acid-Free Ink Made in Japan Special Roller Gel Refill Super Smooth Liquid Gel Ink Available Colour  Black Blue Red Green Orange Sky Blue Pink Violet SAME DAY UK DISPATCH