These filling needles are actually 14 gauge stainless steel tubes 1.5 inches long on a Luer Lock attachment. The 14 gauge tube makes it easy to draw and dispense e-liquids, VG, PG, and flavorings.
Great item. It's a bit wide for a 2.5ml Vivi Nova, but it'll still work with a bit of force. Great on the 3.5 ml Vivi Novas.