(25 Tubes, 15 ?L) PTS Collect 15 ?L capillary tubes provide speed, efficiency and savings — especially for applications where exact sample volumes are required. PTS Collect capillary tubes provide better efficiency and are designed to be easier to use than traditional blood transfer tubes. Using a single glass tube with plastic casing, PTS Collect capillary tubes provide consistent self-wicking technology to preset volumes. This improved design is perfect for blood collection needs covering a wide range of applications across many different medical devices.