Polypropylene rack has 96 wells for 0.5 mL microcentrifuge tubes on one side and 96 wells for 1.5 to 2.0 mL microcentrifuge tubes on the other side. Wells are arranged in standard 8 x 12 array. Handy lid snaps into place via tabs on each end of rack. 0.5 mL wells are separated by molded-in grid lines, making them easier to see, and raised rings are around the 1.5 to 2.0 mL wells make tubes easier to remove. Autoclavable. Assorted colors: blue, green, pink, yellow, and orange. Rack measures 246 x 121 x 50 mm. Pack of 5.