rOtring Tikky Graphic Pencil set of 3 (0.3, 0.5 & 0.7mm) Pen has free ink technology for a constant, consistent line, and a metal-jacketed fibre-tip nib for superior template and straightedge drawing. Pencil's has a brass mechanism for precision lead advancement and a fixed lead guidance sleeve to prevent breakage and provide a clear page view. Lightweight plastic bodies with rubberized grips and triangular barrels offer superior comfort and won't slide on tilted tables. Pens use long-lasting, lightfast, water-resistant pigmented inks (no refillable). Pencil uses high-quality hi-polymer leads (refillable). Pencil's has a brass mechanism for precision lead advancement and a fixed lead guidance sleeve to prevent breakage and provide a clear page view. Not for any use on skin, including tattoos.