Centrifuge Tubes, Polystrene, 15mL, RCF Rating 12000, 500/Cs15 ml capacity tubes: Approximate dimensions: 17 mm O.D.; 120 mm length Sterilized by gamma irradiation and non-pyrogenic Dark blue printed graduations and white writing patch Polyethylene dome-seal screw cap offers positive seal over full circumference Rack can be separated into two sections