Nope, they’re a matched pair of seven-string headless basses – one fretted, one fretless. Made by Haydn Williams, an uber luthier in Cumbria, England: http://www.williamsguitars.fsnet.co.uk/home.html ….the two seven-string guitars on the grouond in the centre of the shot are by him, too.

You can’t see it in the pic, but there’s a copy of ‘Guitar Player’ under each of them. I might voluntarily listen to Merzbow, but even I’m not dumb enough to lay an expensive custom guitar directly onto concrete…