The Fisherbrand 14-961-30 is a high-quality set of 16x125 mm 19mL borosilicate glass culture tubes. Made in the United States, this box of 250 units is designed for use in physical, medical, and biological laboratories. The brand Fisherbrand is known for producing reliable and durable lab supplies, making these culture tubes a dependable choice for research and testing purposes. These tubes offer a sterile and transparent environment ideal for growing cell cultures and conducting various scientific experiments in a controlled setting.