These are some glass test tubes, which are made of safe and gentle materials. They are designed to help you conduct scientific experiments. They have good storage functions and are very suitable for storing chemical liquids for experiments. The transparent design allows you to observe at any time. It is a very practical experimental tool accessory that will meet your experimental needs very well. Features - ColorTransparent - Material: Glass. - Size: 18.00X4.50X1.80cm/7.07X1.77X0.71in. - It is made of proportional materials, transparent and practical, safe and gentle. - Can help you better carry out scientific experiment activities, very suitable for holding chemical liquids. - In addition to being suitable for scientific experiments, it can also be used for the production of DIY glue or other artworks. - It is a good choice as a your kids at school if they do experiments in laboratory. - Suitable for storing items that need to be kept dry or liquid.Sufficient quantity can well meet your needs. Package list: 6 Tubes with Side Arm