It is made in grapefruit, orange (yellow), lemon (greenish-yellow), bitter (herbal extracts), and apple flavors.

The brand's origins can be traced to 1870, when German-origin Román Knörr Streiff and his wife Pilar Ortiz established a beer factory named "La Esperanza".

In the 1920s, one of their sons, Román Knorr Ortiz decided to start his own business to produce sodas, named "El As".

[1][2] Kas promotion has included a landmark 24 Horas Kas campaign in the mid-1990s that included a catchy jingle based on the song "Dame Más" (Give Me More) by Alex de la Nuez a cover of the Steve Miller Band's song "Give It Up" from 1982 album Abracadabra.

The Spanish 24 Horas Kas campaign was adapted to the Mexican market for launch, and the Dame Mas song interpreted by the Argentine pop group The Sacados from their album Alter Nativo heavily promoted, eventually charting high in the Mexican music market.