Sterile syringe/needle combinations have Slip tip or BD Luer-Lokâ„¢ tip. Needles are made of stainless steel with translucent, color-coded polypropylene hubs.Thin wall needles have a bigger I.D. without any increase in the O.D. Thin wall needles allow the same flow volume as standard-walled needles one gauge larger.Note: Needles are autoclavable after being removed from their easy-peel package. They can be sterilized by ethylene oxide in their easy-peel package.