Monoject Syringes with Needles are available in Regular Luer (RL) and Luer Lock (LL). Includes a sterile, stainless steel needle. Regular Luer (RL) means the needle pulls off. The syringe has a tapered tip so it can also be used as an oral feeder. Luer Lock (LL) means the needle twists on and off for a more secure fit. However, the syringe cannot be used for oral feeding. Save when you buy a box.