Ample Quantity: You receive eight 4-well test tube racks in four different colors: blue, orange, green, and yellow, two of each color. These are sufficient to store multiple test tubes simultaneously, eliminating concerns . Size Information: This test tube organizer has different side dimensions. The first side holds four test tubes (suitable for 50 ml tubes); the second side holds twelve test tubes (suitable for 15 ml tubes); the third side holds thirty-two test tubes (suitable for 1.5/2.0 ml tubes); and the fourth side holds thirty-two test tubes (suitable for 0.5 ml tubes). Versatile Use: Our four-compartment test tube organizer is suitable for chemistry labs, science classes, research classes, laboratory organization, and any other place that requires test tube storage, ensuring neat organization and convenient subsequent operations. (The image has been enhanced, and the colors slightly, but this not affect the usability.) Color: As Shown Material: ABS Package Contents: 8 * centrifuge racks Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.