These are OEM needles for the carbs on all the Classic Concours, 1986 through 2006. Kawasaki part number 16030-1007, and referred to as "FLOAT VALVE" in their diagrams. We call 'em float needles here!
Get yourself one for the price shown, or save some money, time and effort, and just go ahead and get all four for the additional price shown in the drop down below.
Concours Float Needles: