LARGE Quartz Cuvette - 50 mm, 5 cm long Cell for Spectrometers. 
2 Transparent windows. The rest are all frosted or "ground" glass. 
One Standard Optical Glass Cuvette (Open-top type, 50 mm light path, 17.5mL volume): The cuvette has a fused optical glass body and 2 transparent windows. 
It fits all standard VIS-NIR spectrophotometers (such as Shimadzu, Perkin Elmer, GE, HP, and Beckman etc.) and is designed for VIS-NIR absorption applications. 
Parameters: Cell Material:Optical Quartz Glass; Top Type Open-top, Teflon lid; Light Path:50 mm; Cell Volume:17.5 mL; Outside Dimensions: 45mm × 52.5mm × 12.5mm; Spectral range 350-2000 nm