These 50ml clear glass test tubes with screw caps are ideal for sample testing and storage, providing a secure and airtight seal. The transparent glass allows for easy observation of contents, making them suitable for scientific research, experiments, and educational use.Features: - Color: Transparent - Material: Glass with aluminum screw caps - Size: 10.00 x 3.00 x 3.00 cm / 3.93 x 1.18 x 1.18 in - Durable transparent glass construction for clear visibility and reliable sample observation - 50 ml capacity ideal for small sample storage in laboratory or DIY applications - Screw-top caps ensure a tight seal to help prevent leaks and maintain sample integrity - Set includes multiple tubes for various uses in scientific, hobby, or home storage applications - Suitable for laboratories, educational settings, and personal projects requiring dependable small containers Package list: 30 x Glass test tubes with aluminum screw caps