This comprehensive laboratory glassware set includes everything you need for basic scientific testing and experiments. The kit features four 14cm (5.5-inch) glass test tubes with generous 14mm openings for easy sample handling. Each tube weighs approximately 29g and comes paired with a matching small funnel for precise liquid transfers. The set also includes two 9cm (3.5-inch) cleaning brushes with twisted wire handles to maintain your glassware in pristine condition. All components are made from quality laboratory glass for clarity and durability. The tubes feature smooth, fire-polished rims and uniform wall thickness for safety and reliability. Perfect for educational settings, home science experiments, or professional lab work, this complete set comes packaged in a sturdy storage box to keep all components organized and protected. The standardized 14mm opening size ensures compatibility with common laboratory equipment and supplies. Please handle with appropriate care as contents are made of glass.