This round hole test tube rack is made of premium plastic material that is lasting use. It is very practical and portable. Waterproof and anti-rust, without taking up too much space. Enough space to store corresponding test tubes. A good helper for your experiment. Features - ColorTransparent - Material: Plastic. - Size: 16.00X8.50X5.00cm/6.29X3.34X1.97inch. - Adopted by materials, sturdy and , lightweight and easy to store. - Can used to store cylinder-like , make your living space more clean and tidy. - With transparent color, make you easily observe the liquid and directly fine it out. A good helper for your experiment. - You can use label to mark, which is easy to distinguish and observe, and to ensure the validity of . - With fine craftsmanship has excellent durability and practicality, suitable for laboratory, school, hospital. etc. Package list: 4 Tube Racks