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Siny Factory 2ml Non-Vacuum Blood Collection Heparin Lithium Tubes. Non-Vacuum Design: Allows manual collection via syringe for delicate or controlled sampling. High-Quality Plasma: Pre-filled with lithium heparin to prevent coagulation effectively. 2-Year Warranty: Comprehensive quality guarantee period for all products. Custom Logo & Packaging: Accepts custom logo printing and package customization. High Daily Capacity: Production capacity reaches 500,000 pieces per day. Free Samples: Free blood collection tube samples provided (customer pays shipping). ISO Certified Factory: Specialized manufacturer with over 20 years of experience. 100% Inspection: Every finished product undergoes visual inspection by packing staff.