Microcentrifuge tubes are small, cylindrical containers commonly used in laboratories for holding and centrifuging small volumes of liquid, typically ranging from 0.5 to 2.0 milliliters. Made from plastic, these tubes are designed to withstand high speeds in a centrifuge, allowing for the separation of components in a mixture based on density. These tubes often come with a snap-cap or screw-cap to securely seal the contents, preventing spills and contamination. They are widely used in various applications, including molecular biology, biochemistry, and clinical research, for tasks such as DNA extraction, sample storage, and protein analysis.