Pentel energel retractable pen refill, 0.7mm, blue ink refill is designed for use with the pentel energel retractable pens. Vivid, super-smooth gel ink dries quickly without smearing, making it perfect for left-handed writers. The permanent ink formula is acid-free and excellent for signatures. Acid-free/quick-drying ink/smear proof. larger quantity quotes available. Please call 1-888-978-7759. this product arrives to most customers in 2-3 business days.