One side of this polypropylene rack has 32 places for 1.5 or 2.0 ml tubes and 8 places for 0.5 ml tubes; the reverse side holds 32 x 0.5 ml tubes and 8 x 1.5 or 2.0 ml tubes. The rows and columns are marked for easy sample identification. Withstands freezing (-90°C) or autoclaving. Mixed neon colors include blue, green, orange, pink, yellow, natural, and black. Measures 6 5/8" L x 3" W x 2" H with lid.