Intravenous butterflies 23G white Intravenous butterflies 23G x 3/4″ (0.60 x 19mm) by Elmed in individually sterilized Peel Pack packaging. Elmed butterflies feature a luer lock tip (female) and a triple-sharpened needle with a siliconized tip to prevent friction. International color coding. Tube: 30cm. Needle: 3/4″ (19mm). Color: white. Indications for use: Peripheral vein access for therapeutic purposes, biological material sampling for diagnostic purposes. Repeated short-term injection or injection of small volumes of drugs or blood derivatives. Single blood draw. Difficult or small-diameter veins, such as in infants and children, and normal adult veins.