Monoject Blood Collection Tubes – Feature silicone-coated, colored stoppers for safety and convenience; ideal for a variety of applications. Sterile tube interior. Available with or without additives. For procedures requiring plasma or whole blood, general hematology and certain chemistry procedures, non-silicone coated tubes feature lavender stoppers and contain liquid additive EDTA (K3) [0.10 ml, 15% solution], 16 mm, 5 ml or 10 ml draw. For procedures requiring serum, general chemistry and serology procedures, silicone coated tubes feature red stoppers and contain no additive, 16 mm, 3 ml or 10 ml draw. Box of 100.