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Lead size (diameter): 0.7 mm — a medium-thickness mechanical-pencil lead. Kokuyo Store+2Bridge Stationery+2
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Lead hardness (grade): HB — the “standard” pencil hardness, roughly equivalent to a #2 pencil: good balance of darkness and durability, suitable for writing, notes, general use. Bridge Stationery+2Rokomari+2
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Refill format / packaging: Leads are supplied in small plastic “tubes” or containers. Often each tube contains a small number of leads (common: 12 leads per tube) and the multipack contains multiple tubes. Bridge Stationery+2Elite Webstore+2
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Lead length: Typical refill leads are ~ 60 mm long. Kokuyo Store+2Kokuyo Camlin+2
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Material / Strength: Many modern 0.7 mm HB “super-polymer” refills are designed to be stronger / more break-resistant than ordinary leads — good for frequent writing, less prone to breakage under pressure. Bridge Stationery+2Fepy+2
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Compatibility: Such refills are designed to fit standard 0.7 mm mechanical pencils. As long as pencil accepts 0.7 mm leads, it should work. Bridge Stationery+2Cartridge People+2
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Use cases: Everyday writing (notes, classwork, office), sketching or drafting where standard darkness and line thickness suffice, general-purpose use. The HB / 0.7 mm combo is often preferred for regular writing tasks. Bridge Stationery+2Fepy+2
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