From the website:
Field a pair of powerful Primaris Space Marine heroes with this bundle. In it, you’ll receive a Primaris Captain and a Primaris Librarian:
The Primaris Captain is a superlative warrior and strategically gifted commander who leads Space Marine companies into battle. Armed with a choice of bolt rifle, Stalker pattern bolt rifle and power sword, his Mk X Tacticus power armour is larger and bulkier than his underlings, and features an iron halo and billowing cloak. He comes with a bare head option.
The Primaris Librarian strides into battle amidst a blaze of psychic energy, blasting foes with warp-force or revitalising their brothers with incredible dynamism. His accoutrements are many and elaborate, from his ornate multi-layered cloak to the detailed wiring going into his psychic hood. He’s armed with a force sword and a holstered bolt pistol, and comes with a bare head option.
Both of these miniatures are non-Chapter specific, and each come with a Citadel 40mm Round base and Ultramarines-Character Transfer Sheet, which features Captain, Chaplain, Librarian and Lieutenant iconography.