this is my biggest bass model.  The Kaagstein brother were bassist at the Staatskapell Berlin and made perhaps around 10 – 15 double bass. The model is very much simular to the early Mittenwald makers, like the Klotz family, Rieger, Neuner and Hornsteiner. Actually  I use a f hole drawn from a Sebastian Klotz viola. String length 109cm, it has got a dark powerful sound, great for enhancing a deep bass sound to  the  group and still it is remarkably easy to play. It also good for Continuo playing