Feature: 1. Borosilicate Glass Material: Our glass tubes for glass blowing are fashioned from borosilicate glass, unbreakable, high temperature resistant. The clear color of the tubing enhances visibility and adds an aesthetically pleasing touch. Its strength and compatibility with microwave ovens and dishwashers make these glass tubes a truly utility product. 2. Size and Quantity: Each borosilicate glass tube measures approximately 4 inches/ 10 cm in length, 0.47 inch/ 12 mm OD, 0.31 inch/ 8 mm ID and 0.08 inch/ 2 mm in thickness, which is the ideal size for various institutional and personal needs. The package comes with 6 glass tubes with a cleaning brush, thus ensuring you are well equipped for your tasks. 3. Multi Purpose: These are not just ordinary glass blowing tubes. These borosilicate glass tubes also serve as ideal glass test tubes suitable for laboratories, schools, and factories. In addition to professional use, do not limit your creativity as they can also be applied as drinking straws or for various DIY projects. 4. Safe and Long Lasting: Our glass tubing is resilient to high temperatures. This makes them safe to be applied in microwaves and dishwashers. Moreover, both the ends are fire polished ensuring no harm to your hands, amplifying safety and longevity. 5. High Transparency: Our industrial glass tubing is characterized by its high level of transparency, which makes it an ideal choice for laboratory work where observation and accuracy are paramount. Specification: Item Type: Borosilicate Glass Tube Material: Borosilicate Glass Weight: Approx. 145.00g / 5.11oz Length: 10cm / 3.9in OD: 12mm / 0.5in ID: 8mm / 0.3in Thickness: 2mm / 0.1in. Package List: 6 x Borosilicate Glass Tube1 x Brush