HB Hardness: Same as No. 2 pencil. Superior quality. World's No. 1 selling lead. A Recycology product (Recycology products are a minimum of 50% recycled material by weight excluding consumable content and refills). 1 tube with 30 refill leads. Fits all brands of 0.5 mm mechanical pencils. Consistently smooth writing, resists breaking, and produces a clear, dark line. HB hardness is equivalent to a No. 2 wooden pencil. Guaranteed to scan on all tests and documents. A Recycology eco-friendly product. 100% Recycology product (Recycology products are a minimum of 50% recycled material by weight excluding consumable content and refills). Writing starts with us. Break resistant. Please recycle packaging. Recycology: The science of reduce, reuse and recycle. Limited Lifetime Warranty (Valid in USA Only): Each Pentel product is warranted for life against failure due to defects in materials and workmanship. For warranty service, return product for free repair or replacement to: Pentel of America, Ltd., 4000 E. Airport Dr., Ste. C. Ontario, CA 91761, USA, Attn: Quality Assurance Department. Visit us at www.pentel.com. Made in Japan.