Pentel EnerGel Reill 0.7mm Blue PK12 The Pentel LR7 Blue Ink refill is the standard Energel refill suitable for most of the 0.7mm refillable Pentel Energel range, including the Energel-XM, Energel-X and Energel Stirling. Energel ink is a vivid, liquid gel ink, fast drying and no smudge, suitable for both left and right handed users. The refill is available in most standard colours.