Wide-mouth pathway of flo-top collector permits capillary blood to flow freely into tube, minimizing chance of premature clotting in collection top. The unique �twist-assist� MICROGARD closure significantly reduces blood splatter upon removal, in comparison with other tube closures. 200-400 micro-liter capacity. Made of break-resistant plastic.- MAP Microtube For Automated Process with K2EDTA 1.0mg, BD Microgard Closure, 50/bx