Type 41 Macro Cuvette with Screw Cap (Material: Optical Glass) (Lightpath: 1mm)• Cuvette has an airtight cap, which screws onto the top of the cuvette• Each cell comes standard with one closed screw cap and one open screw cap with a self-healing injection disc (SEPTA)• Material is Optical Glass (transmits over 80% between 340-2,500nm)• Two windows optically polished• Lightpath is 1mm• Outside dimensions 3.5x12.5x55mm• Inside Dimensions- 1x10x45mm• Capacity- 0.4mL