Pentel Ain Stein 0.5 4B Leads

Pentel's Ain Stein mines have been developed to be 10% stronger than the existing Pentel mines making them the most resistant mines in the world. Ain Stein mines are the only 0.5mm - 4B mines that exist. Despite the superior resistance to breakage, they provide smooth, flowing writing. Ideal for all types of mechanical pencils. The new design of the tubes is thinner, simpler and more practical.