Limit waste and save money with our 1.5 mL Small Volume Tubes that are specially made to closely fit the diameter of 1.6mm sample probe. This allows immersion of the tip inlet in a minimum volume of liquid, therefore limiting the amount of dead volume in the tube. If you are working with expensive materials in your lab, these are a must have. These polypropylene tubes fit flush in the 48 Sample Microcentrifuge Rack. There are no caps for these tubes, however, when seated in a Microcentrifuge Rack a pierceable or septum pierced cover can be used.