The ultimate classroom test tube! These "preform" test tubes are the early stage of a 2 liter soda bottle. They are virtually indestructable, dishwasher safe, and they are clear to let young scientists see everything that is going on inside. (all preforms this size have a very slight greyish tint) These are also often used in geocache applications. Caps are included. Available in packs of 5, 15, or 30.

Each large preform test tube measures approx. 5.75 inches (15cm) tall, and each holds about 2 ounces (60 ml.)