Pentel Hyper G Retractable Gel Roller Pen, 0.5mm, Fine Line, Permanent Blue Ink, Box of 12 (KL255-C) Low viscosity ink is Check Safe (permanent), acid free and Earth Safe (Recycology) Diamond-cut barrel design with silver accents Made of 57% recycled plastic and refillable with Pentel KLR5 refills Durable, metal tip writes 0.5mm fine lines Box includes 12 Pens