... ISO standards and TUV standards, Safe, easy, environment-protect Syringes, Disposable syringes, insulin syringes,Safety Syringe Syringes, Disposable syringes, Sterile Syringes, ... easy measurement of the volume contained in the syringe and detection of air bubble.4. Graduated scale on ... very well to allow for free and smooth movement.6. Material for barrel and plunger: Medical grade PP(polypropylene).7 ...