Features: Crafted from premium borosilicate glass, this laboratory glassware withstands extreme thermal shock up to 500°C, ensuring cracks resistant safety and uninterrupted operate during critical chemical experiments. Boasting outstanding chemical stability, our borosilicate tubes resist erosion from strong acids and alkalis, preventing contamination and guaranteeing purity in sensitive chemical experiment equipment. Ideal for educators and students, this essential teaching supply provides stable performances for academic demonstrations, laboratory training, and rigorous research applications requiring uncompromised component integrity. Perfect for classroom labs, field science excursions, and research facilities, the high transparency design enables clear reaction monitoring while its lightweight construction simplifies transport and storage logistics. Engineered for durability and durability , these reusable tubes offer clear visibility for precise measurements and support conscious laboratory practices through their recyclable composition. Specifications: Component : high borosilicate glass Spout diameter: about 14mm/0.6inch Package Includes: 5xExperimental Glass Tube note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.