Blackwing Natural Set 12 Pencils Extra Firm The Blackwing Natural features our popular extra-firm graphite that works well for extended writing and detailed line work.  Each pencil features an exposed barrel with a subtle transparent matte finish, the iconic square Blackwing ferrule and grey eraser. Erasers are replacables. Hard Japanese graphite lead. Genuine incense cedar wood. Available in different hardnesses and designs. Brand: Blackwing.