The quint guitar
The Quint Guitar is tuned five notes up - that makes it the same pitch as hago's alto.
The tuning is B E A D F# B
Like the alto, the quint is short-scale - typically 430mm. Shorter than the alto, quint strings are thicker than the alto.
The quint bass guitar
And underneath, there's the Quint Bass - five notes down (like a baritone), and typically on a 700mm scale neck.
The tuning is A D G C E A
The strings are marginally thicker than a bass's.
Curiously, the tuning is not an octave under the Quint ...see why here