Eh? It's a carbon filter wrapped in plastic mesh, and the carbon part itself is a block that is bound together with plastics. :)

But if you want one, it is an iSpring CKC1C. Sets up quick, takes generic/COTS replacement filters.

(I used to use a Pur filter on the faucet and that also worked well, but it was filtering a lot of stuff that isn't an issue with my tap water, and the razor blade business model of vendor lock-in was more expensive to support than I preferred.)