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The highest quality graphite pencils. Patented anti-slip GRIP zone, with small massage points. Ergonomic triangular shape. Soft, quality wood, for good sharpening. The special technology of gluing the lead to the wooden body prevents its damage in case of impact. Water-based paint, for environmental protection. Lead hardness B. In covered, dry places, protected from weather or heat sources, clean, with relative air humidity 40-60% and temperature between 10-25 C