Features0.7mm HB Refill leadSuitable for all 0.7mm mechanical pencilsAbout 10% stronger than any other Pentel refill lead thanks to a ceramic cell structureSmoother than other refill leads on the market40 leads per tubePentel Ain Stein C277 0.7mm lead. The new improved Pentel Ain formula utilises a molecular ceramic frame to support the graphite and lubrication particles. This greatly improves strength, enhancing break-resistance of the Pentel Mechanical Pencil Ain Stein Refill Leads 0.7 HB while continuing to provide superior smoothness and darkness. Pack of 40 0.7mm x 60mm leads suitable for all 0.7mm mechanical pencils.