Material: barrel-made of medical, transparent polypropylene with plunger stopped ring. Plunger: made of medical polypropylene. Standard piston: made of natural rubber with two retaining rings. Latex free piston: made of synthetic non cytotoxic rubber, free from the protein of the natural latex to avoid possible allergy. According to the iso9626. Needle hub: made of medical grade pvc colored according to iso6009. Needle protector: made of medical grade transparent pvc or pe. Lubricant: silicone oil, medical grade(iso764 and usp class vi) Graduation: indelible ink Blister or plastic package: medical grade paper and plastic film.