I don't own these, but I always stop to look at pictures of these basses whenever I open the Luthier's Access Group website.
[url="http://www.luthiersaccessgroup.com/dt_catalog/leduc-ubass-6-twin-fret-and-fretlessmagnetic-and-piezo-pickup/"]http://www.luthiersa...d-piezo-pickup/[/url]
Leduc UBass 6, both fretted and fretless.
On an individual basis, they are $4,500 but as the twin set, they are $8,250.