These Macro (10mm path) and Semi-Micro (4mm path) cuvettes are specially packaged to reach you scratch- free. Cuvettes are 45mm high. Manufactured from optically clear polystyrene formulated for superior clarity and transmission. Fits most spectrophotometers including Beckman, Perkin-Elmer, Gilford, Hitachi, Varian and Shimadzu. Each cuvette is packed in its own individual compartment in dust resistant trays to assure scratch-free optical surfaces. Polyethylene caps with flexible double seals are also available.