These high-quality lead refills always produce smudge-resistant, clean marks and sharp lines, making them perfect for everything from architectural drafting to school work. Enhancing their value for both busy professionals and students, both the leads and erasers are packaged in convenient clear tubes, so it's easy to tell when more are needed. Lead Degree (Hardness): HB; Lead Color: Black; Refill(s) For: All Bic Refillable Mechanical Pencils.