Pyrex Laboratory Bottle with Screw-Cap and Pouring Ring, Polypropylene, Graduated, GL 45, 500 ml, Clear. This bottle With an easy-to-read scale and large labeling field for easy marking in fired-on, highly durable With proven PYREX properties. Complete with blue screw cap (Polypropylene, integral lip seal) and pouring ring (Polypropylene) for drip-free pouring and clean, safe