These syringes are really nice for filling lip balm tubes. The amount of liquid you can pull in will fill a couple of tubes at a time. I do clean and reuse them which is a bit tricky. I pour boiling water over them and scrub them clean with small brushes. Afterward I spray them with alcohol to sanitize and dry them for additional uses. I do need to prime the rubber plunger with some of the oils that are in my product for it to move smoothly again. I find that if you warm them first you have very little waste of product from it cooling inside the syringe. I do that by placing them inside a plastic bag and into a cup of hot water.