Wells hold standard cuvettes with a 13mm cross-section. Sloped top makes the second tier more accessible. Array: 16-Place. Made of polypropylene. Steam autoclavable at 121 degrees C (250 degrees F). Greatly reducing the chance of damage to cells. Permits easy viewing of solution color to be measured; helps prevent breakage. Can be fitted horizontally in the base after usage for storing purposes. Dimensions (L x W x H): 210 x 70 x 35 mm. 5pcs