These containers are available in both polystyrene and polypropylene. Polystyrene enhances clarity while polypropylene improves durability. Both options come with a convenient pour spout for simplified specimen retrieval. Printed lids can be purchased separately. Lids have lines for patient name, doctor, date, time, am/pm, room number and case number.- Accessories: Paper Lid For #4629 & #4630, 500/cs 14-21 Days