Proper Dimension to Apply: the size of these test tubes with lids is about 0.63 inches/ 16 mm in tube mouth diameter, 5.91 inches/ 150 mm in height without lids, 6.3 inches/ 160 mm in total height, 0.84 oz/ 25 ml in capacity, appropriate and convenient to use, without taking up too much space Adequate to Meet Your Needs: you receive 100 pieces of plastic vials in total; The quantity is sufficient to apply and replace, and can easily meet your daily use and other requirements Serviceable and Lasting: each plastic tube is made of quality plastic, reliable and sustained, not easy to deform or break, and can be for a long time; The of the tube is smooth and comfortable to touch, you can use it with ease and confidence Good Sealing to Operate: equipped with fitting lids, these candy tubes keep a good seal without leaking or scattering, you can put candies, liquid, beads, flavorings and so on, bringing you a pleasant and easy using experience Extensively Applicable Occasions: the plastic test tube is suitable for diverse kinds of occasions, including but not limited to science experiments, plant propagation, science parties, carnivals, classroom laboratories and others