This 36-piece set includes 30 high-quality borosilicate glass tubes and 6 cleaning brushes, designed for safety, durability and versatility.Each glass tube features thick heat-resistant material (8mm diameter, 2mm thickness) for stable performance and long service life. All glass tubes have smooth fire-polished, burr-free ends to prevent cuts during handling.The included brushes make it easy to clean the inside of each glass tube thoroughly, keeping them clear and reusable for a long time. Widely used in laboratory experiments, glass art creation and industrial applications, this all-in-one kit provides great value for hobbyists, technicians and professionals.