Rota-Rack Rotating 4-Way Rack for Large Tubes Features: Made from polypropylene Suitable for a massive variety of culture, centrifuge, micro centrifuge, round, flat or conical bottomed tubes Polypropylene rack maintains its orientation until you twist it again. Tubes: 50ml Wells:2 Well Dia: 29 mm Tubes: 10-15ml Wells: 8 Well Dia: 20 mm Tubes: 15-20ml Wells: 6 Well Dia: 16 mm Tubes: 10-13ml Wells: 10 Well Dia: 13.5 mm Dimensions: 8.81 x 4.33 x 4.33 in (22.4 x 11 x 11 cm) Color: purple, blue, green, yellow Autoclavable Get organized with this fun, interlocked rack. Rotate each of the four modules independently to configure for the tubes that you want to use.