Graduated borosilicate amber glass micro-vials range from 1mL through10mL. Made with extra thick glass walls for both sturdiness and magnification of contents. The conical cavity allows maximum retrieval of contents with a syringe needle. Supplied with open top screw thread closure and PTFE-faced silicone septum. Twelve vials are securely packaged in space-saving clear plastic containers and over-packaged in corrugated shipping containers.