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Specification | Color | Diameter of needle | Average Blood Volume |
33G | 0.23mm | Low | |
32G | 0.26mm | Low | |
31G | 0.25mm | Low | |
30G | 0.32mm | Low | |
28G | 0.36mm | Medium | |
26G | 0.45mm | Medium | |
23G | 0.60mm | High | |
21G | 0.80mm | High |