When do some pretty basic experiments and this avoids the whole broken glass issue. The plastic test tubes with a tight fitting cap, no rough edges, they are water and air tight, have a good seal. Great for making scientist concoctions. Also can be used as birthday goody bag gifts.Features- Color: Transparent.- Material: Plastic.- Size: 9.50 x 2.00 x 1.50cm/ 3.73 x 0.79 x 0.59 inch.- The product is made of PP plastic material, safe, durable and sturdy.- The plastic test tubes are with accurate scale on its body, which is easy for you to read the accurate liquid volume.- You do not need to worry about liquid leaking because each screw is leakproof.- It not only can be used for school, scientific laboratory using, but also for holding small items.- Great choice for decorating Halloween Christamas festival, scientific themed kids birthday party supplies and decorate the house.Packing List:30 x freezing tubes