My mother-in-law (RN) brought some of those home for me a while ago, but I haven’t used any of them yet. {gee thanks mom } It’s called the VanishPoint Syringe and is made by Retractable Technologies, Inc. The one’s I have are 3cc 25g 5/8. I imagine it was designed to help nurses and doctors avoid getting pricked my contaminated needles. I don’t see any advantage for the home AAS user. After all, I know I’m clean. Plus the needle is fixed.