Quality: the Big Dry Longgleife pen impresses with its unique high-tech automatic printing, precise edge tracking when recording and the extremely long marking performance Practical: the leads can be refilled at any time and do not need to be sharpened, a push of a button on the pen and you can achieve a perfect drawing result again 4070: The summer special leads are stable up to 70°C and suitable for most surfaces. They are not suitable for glass, shiny surfaces. Quality: The Big Dry Longleife Pen impresses with its unique high-tech automatic pressure, precise edge removal when picking up and the extremely long marking performance; Practical: the leads are refillable at any time and do not need to be sharpened, at the touch of a button on the pen you can achieve a perfect drawing result; 4070: the summer special leads are resistant to 70 °C and not suitable for glass smooth, PICA-BIG Dry 1 x marker + 12 refills 6070 Graphite Summer Heat quality: The Big Dry Longgleife pen impresses with its unique high-tech automatic pressure, precise edge guidance when recording and the extremely long marking performance. Practical: the leads are refillable at any time and without sharpening, a push of a button on the pen and you will achieve a perfect drawing result again 4070: The summer special leads are stable up to 70°C and suitable for most surfaces. They are not suitable for glass and glossy surfaces.