The 3D Tray Mixer is a mixing instrument with three-dimensional movement, which has gentle motion and won’t produce air bubbles, for blood collection tubes and centrifuge tubes . It is ideal for small sample doses. The mixer’s convex pad holds tubes securely in place. The number of tubes that can be held includes: 60 * 1.5ml, 30 * 3ml, 21 * 7ml, 17 * 15ml, and can be used in the freezer.