Sexteto Y Septeto Havanero - Aquella Boca download song

I love this, thank you! What instrument makes the sound at 26 seconds, and then again at 55?

The Sexteto Habanero recorded 10 "sones" on March 19 & 21,1927 in Havana, Cuba for RCA Victor including "Aquella Boca" by Eusebio Delfin with the following personnel: Abelardo Barroso, "El Gran Caruso", "La Puta" (claves,first voice in the chorus of the "largo" & improvisor in the "montuno"), Felipe Neri Cabrera (maracas, first voice ONLY in the "montuno" chorus, not in the "largo"), Guillermo Castillo (guitar, second voice in the "largo" & "montuno", Carlos Godinez (tres), Gerardo Martinez