Product Description: Low coefficient of thermal expansion, excellent thermal and temperature resistance and corrosion resistance. ■Borosilicate glass at an affordable price. Product specifications: Model number: 3160072; Material: Borosilicate glass 3.3; Thermal expansion coefficient: 13.3 x 3.9 - 7/°C (20 - 300°C); Autoclavable; Outer diameter x height: 3.1 x 0.7 inches (80 x 17 mm); BOROSIL(R) (Manufacturer) Azuwan