One Standard Fluorescence Quartz Cuvette (not one pair): Open-top type, 10 mm light path, 3.5 mL volume, 4 transparent windows. The cuvette has a fused quartz body and windows. It fits all standard UV-VIS fluorescence spectrophotometers (such as Shimadzu, Perkin Elmer, GE, HP, and Beckman etc.). These cuvettes are designed for UV-VIS-NIR fluorescence applications.