[1]More pages claim based on maximum-capacity cartridge yields for the predecessor product, HP 507A Black Original LaserJet Toner Cartridges, compared with page yields for HP 508A Black Original LaserJet Toner cartridges. For more information, see http://www.hp.com/go/learnaboutsupplies.
[3]Approximate average yield based on ISO/IEC 19798. Actual yield varies considerably based on content of printed pages and other factors. For details see http://www.hp.com/go/learnaboutsupplies.
[1]More pages claim based on maximum-capacity cartridge yields for the predecessor product, HP 507A Black Original LaserJet Toner Cartridges, compared with page yields for HP 508A Black Original LaserJet Toner cartridges. For more information, see http://www.hp.com/go/learnaboutsupplies.
[3]Approximate average yield based on ISO/IEC 19798. Actual yield varies considerably based on content of printed pages and other factors. For details see http://www.hp.com/go/learnaboutsupplies. Show Less