Yes, they are classical guitar strings. The uke sets that Savarez now offers (140R/150R), are made up of the 540 Alliance (guitar) trebles. Prior to the sets being offered, you just made your own set from the Alliance (fluorocarbon) classical single strings.
I still make my own sets using the KF52 (.0205) 542R/KF69 (.0272) 543R/KF84 (.0331) 541R/KF62 (.0244). The Savarez (150R) made sets for the tenor consist of the KF52 (.0205)-KF69 (.0272)-KF84 (.0331)-KF57 (.0224). Basically, I'm just using a little thicker G string.
Savarez offers so many sizes in the singles you can really tailor your set any way you like.