Set of four sibata 2306a-series volumetric flasks: 1 each 10Ml, 25Ml, 50Ml & 100Ml capacity sizes included in the Kit. The flasks meet ASTM e-237 Class a, style I specifications. Feature machine-blown bodies and heavy-beaded, heavy-tubing necks, tooled for stoppers. The graduation line is sharp and permanent; large, white, block-letters allow the labeling to be easily read. All flasks supplied with a glass tapered stopper. All markings in durable white enamel.