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