Buffered Peptone Water (BPW), Sterile, Ready to Use Pre Enrichment Media, 9mL, Screw Cap Tube (Plastic) 100/Case. This convenient 9mL screw cap tube is perfect for small-scale microbial enrichment. Its sterile condition ensures that your samples are uncontaminated during preparation, making it ideal for precise laboratory testing. The screw cap design provides secure storage and ease of handling, supporting efficient laboratory workflows for microbiological research and testing.