The 20 gauge 2.0 inch has a canula made of pure teflon, and is excellent for adhesives such as cyanoacrylates, anaerobics, and other epoxies which tend to clog in a stainless steel needle. Polypropylene plastic threaded hub, with a UV bonded pure teflon canula. If you order a quantity of 1, you will receive 50 tips in a box.