2.25ML Borosilicate Glass Syringe with Golden Metal Plunger | 10 Pack | Anti-Leak Luer Lock Syringe without Needle | Accurate Measuring Syringe for Liquid, Glue, Oil w/ Borosilicate Glass Tube

I buy these https://a.co/d/02j7yBlY I like the larger size. They also make a 1ml as well but I was burning through them. Just make sure to get glass not plastic. You can also get stainless steel wide luer lock needles that are helpful for filling.

If you haven't already I highly recommend these syringes. Makes it so much easier to work with and stops the plunger from ripping off if your oil is to thick. Here