This pack of twelve plastic syringe tubes are super handy. They are perfect for using with my resin crafts, for the tiny things that are hard to get resin into. i also love them for using for putting different spots of color into my resin for decoration or design. I used one to give my bird some medication and it was like it was made for it. There are so many uses for these that I might have to get more! These are industrial grade plastic with no odor and are non toxic. They will last as long as you don't let resin or glue harden inside of them. I absolutely love these!