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Hi, thanks for your message. This is the deskjet 3050 page which isn't correct for what you're looking for. The HP deskjet 4100 is a series number rather than a specific model number. The models will be something like HP Deskjet plus 4110 or HP Deskjet 4120e. If you can let me know which model you have, I can point you in the right direction. For example here are the cartridges for the HP DeskJet Plus 4120e printer:
https://www.tonergiant.co.uk/model/HP-DeskJet-Plus-4120e-ink-cartridges/
Or alternatively you can see the full HP 305 range by clicking the link below. Bear in mind that models with an 'e' at the end, don't use compatible cartridges.:
https://www.tonergiant.co.uk/model/HP-305-ink-cartridges/
If you need any more help, let me know.