The Fisherbrand 14-961-31 Disposable Culture Tubes are made of high-quality borosilicate glass, providing excellent thermal properties and resistance to breakage. These tubes come in a convenient case of 1000 and have a cork/stopper lid type that is not included. The model number 14-961-31 identifies this specific product, ensuring compatibility and quality assurance for your laboratory needs. Perfect for storing and transporting culture samples, these tubes offer a reliable and durable option for scientific research and experimentation.