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These Pentel refill leads come in a pack of 12 house in a secure plastic tube. The leads are compatible with most mechanical pencils of the same lead width. Pentel leads are formulated to be break-resistant with a slow wearing dark graphite. - 0.5mm leads - 12 leads in each pack - Ideal for paper, tracing and drafting media - Extra strong, slow wear rate, dark colour - Suitable for all Pentel automatic pencils - Hardness: H