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, . , . Pitt Graphite Matt .
6 . : Pitt Graphite Matt 6 - 2B, 4B, 6B, 8B, 10B, 12B
11 : Pitt Graphite Matt 8 - HB, 2B, 4B, 6B, 8B, 10B, 12B, 14B, ,