The Dynarex SecureSafe Safety Hypodermic Needles provide a sterile, effective way to deliver comfortable injections. All needles are color coded to represent the gauge of the needle are compatible with both luer lock and luer slip syringes. The thin wall needles have a double bevel, allowing for ease of penetration while helping larger doses flow smoothly. The SecureSafe safety mechanism features a quick cover that enables the user to cover and protect the needle with a press and snap.