FLMedical's Vacumed® Plain White Cap line of blood collection units come in a variety of differing sizes and volume capacities. There is obviously their standard size, measuring 13 x 75 millimeters. This size sports various volume capacities, such as 2, 3, and 4-milliliter blood volume capacities. This line also sports a 13 x 100-millimeter tube with a blood volume capacity of 6 milliliters, and a 16 x 100-millimeter size with a total blood volume capacity of 9 milliliters.