This test tube is made of high-quality material for durable and reusable purposes. The transparent plastic tube comes with a screw cap and is easy to seal. Each plastic tube is fitted with a lid and pressure-sensitive foil, providing a seal that resists moisture and maintains tightness. The precise design ensures practical usability in high-performance applications. Dimensions: 14 x 2.5 x 3 cm (L x W x H). Volume: 40 ml. Each tube is capped and suitable for the storage of liquids, samples, and handmade products. Material: Plastic. Color: Transparent. Package Contents: 30 x Plastic test tubes, 30 x Aluminum screw caps. Only the above package content is included; other products are not included. Note: Light and different displays may cause the color of the item in the picture to vary slightly from the real thing. The measurement allowance is +/- 1-3 cm.