These models of polypropylene cylindrical test tubes are developed by FL Medical, a leading manufacuerer of disposable labware since 1979. They have no rims and they come in different sizes from 11.55 x 55 mm to 16 x 100 mm. Test tubes with container capacities of 3 ml, 5 ml, 7 ml, and 10 ml are also available depending on the model. The 21014 and 21014 B models are Sorwall type test tubes that are available in bag of 250 pieces. FL Medical also has test tubes with graduations such as models 21021 and 21027.