One rack holds four types of microtubes: 0.2 ml individual tubes (32), 0.2 ml tubes in strips (96), 0.5 ml tubes (16), and 1.5 or 2.0 ml tubes (24). Interlocking 96-place inset rack can be removed and used separately. Rows and columns labeled for easy sample identification. Includes transparent lids. Polypropylene, measures 8" L x 4 5/8" W x 2" H with lid.