I'd suggest getting 1, 3, 5, and 10 ml syringes. Myself I use the 1 ml syringes mostly for flavors with a 18 gauge blunt tip needle, and I use a separate syringe for each flavor. So I have more 1 ml syringes than any other in my kit. The 3, 5, and10 ml syringes are for my PG, VG, and my Nic...