Size:0.7 mm Coopay 600 Pack Lead Refill 0.7 mm HB Break Resistant Mechanical Pencil Lead, 12 Pack Per Tube, 50 Tubes (0.7 mm) Commonly style: Universal size at school or office, these lead refills can work well with 0.7 mm lead mechanical pencil; The details it wrote down can be scanned by machine Wide applications: Suitable for all general writing applications such as notes, letters, and you can use it for office, classroom, home and other occasions Specifications: Quantity: 50 tubes (600 pieces) The diameter of a lead: 0.7 mm The length of a lead: 60 mm Color: black Package includes:  50 x HB black lead refills (0.7 mm) Note: Please confirm your pencil suitable for 0.7 mm before ordering.