Flexoject™ silicone dispensing tips are interchangeable with any Luer Lock or Luer Slip style syringe. Flexoject™ dispensers are made in the USA from medical grade silicone that is manufactured to be soft and flexible. These features allow the dispensing end to gently bend with your pet when they move their head, resulting in less spillage and more successful delivery of liquids.. ****Innovet Pet Products are designed for external use, NOT for implantation****