Specification: 12/13 X 75mm, 12/13 X 100mm Additive: Sodium heparin or Lithium Heparin Blood Volume (ml): 2, 3, 4, 5. 6, 7 Packing: (1). For 12/13 X 75mm, 12/13 X 100mm: 1200 PCS per carton Description: It’s used for blood collection and clinic test items as plasma biochemistry test and blood rheology test. Special attention: only Lithium heparin tube or Gel & Lithium heparin tube can be used for electrolyte test in clinic