TechLITE Pen Needle 31G (5mm), Yellow. Designed to deliver reliably smooth and confortable insulin injections. Disposable needles combine thin-wall technology with precise lubrication techniques and pinpoint sharpening to help provide a safe and precise insulin injection experience. Enhanced "smart thread" design helps prevent insulin leakage and ensures a secure fit to major pen brands. Thin wall technology promotes precise insulin flow and a smooth accurate injection experience. Precision cutting techniques create a sharper point which facilitates smoother penetration into the skin. Continuous level of silicone lubrication provides gentle penetration.