These syringe packs are useful for: Vape tank filling & juice mixing, Ink cartridge refills, pen refilling, decanting, solder paste, flux, thermal grease, light grease, oils, lubricants, firearm cleaning and oiling, wood glues, adhesives, calking, sealants, model building, aquariums, boats, automotive, crafts, painting, 3D printing, water photography, precise liquid measurements, microscopy, science experiments, aerospace, and countless other uses!