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High-quality Improvacut vacuum blood collection tubes, containing 3.8% sodium citrate (4.5ml), are designed for coagulation studies. These 13x75mm PET plastic tubes feature a rubber stopper for multiple punctures and a protective, ribbed, screwless plastic cap. Each tube includes a peelable, dual-numbered paper label indicating sterility information, manufacturer details, expiration date, and blood collection volume. The tubes are color-coded blue for easy identification and are supplied in a polystyrene rack, shrink-wrapped for sterility, with 100 tubes per pack. Ideal for reliable and efficient coagulation testing.