Material:Quartz glass size:10mm light path OD = 12.5mm X 12.5 mm X 45 mm Window Thickness 1.25mm Package Contents: 1*Cuvette set(2 pcs) Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.