Falcon® 15 mL polystyrene conical centrifuge tubes have a 1,800 RCF rating. The tubes come with polyethylene dome seal screw caps. The sterile tubes are packaged 50 per bag and 500 per case. RNase/DNase-free. Approximate dimensions: 17mm O.D.; 120mm length Sterilized by gamma irradiation, noncytotoxic and nonpyrogenic 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