This test tubes is made of high quality material for durable and reusable purposes. The transparent plastic tubes comes with screw cap and is easy to seal and grind. Each plastic tube is fitted with a lid and pressure sensitive foil, which an seal and resist moisture and tightness. The precise design ensures the practical implementability in the work of high performance. Dimensions: . 14 x 2.5 x 3 cm (l x w x h). Volume: 40 ml. Each tube is capped, suitable for the storage of liquids, samples, handmade . Material:plastic colour:transparent Package Contents: 30 * plastic test tubes 30 * aluminum screw closures Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real . The measurement allowed error is +/- 1-3cm.