Genuine HP 37X High Capacity Black Toner Cartridge - CF237X CLT-Y603L TN-910C: This is a genuine

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They can sit for up to 6 months without issue

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Genuine HP 37X High Capacity Black Toner Cartridge - CF237X CLT-Y603L TN-910C: This is a genuineThis is a genuine High Capacity HP 37X Black Toner Cartridge. This toner is manufactured by HP for use in your printer, giving you easy drop in installation, professional & crisp print quality, at a great low running price. This high capacity toner is intended for high volume offices, with a massive yield of up to 25,000 pages. At more than double the pages of the standard capacity toner, the HP 37X gives brilliantly low running costs over time.