trouble is there is no standard terminology, so a Jazz can be 'thin' i.e. 38mm at the nut, but can be quite 'wide' i.e. front to back. whereas a geddy lee jazz is both thin at the nut and slim front to back, and some P's are wide (44 mm nut) but can be fairly thin front to back. there's a much more detailed thread on here somewhere about exactly this subject. i think you can only really get an idea from specs but in the end you have to pick it up 'in the flesh' as it were, and see if it's to your liking.