200 Pcs 5ml Plastic Frozen Test Tubes, 5ml Centrifuge Test Tube, Frozen Test Tubes with Screw Cap for Office School Laboratory Chemistry Sample Specifications: Material: PP Specification: 5ml (erect) Packing: 200 pieces / bags Outer diameter: 16mm Height: 59mm Features: ★High Transparency - it is easy to observe the condition in the test tube. ★With 1-5ml calibration, easy reading of the liquid volume. ★Orange Compact Screw Sealing Cap - firmly matched, and the sample will not volatilize. ★Low Temperature resistance - can be cryogenic (-180 ℃) ★Used in hospitals, epidemic prevention station, schools, scientific research laboratory, etc. Package Included: 1 Bag x Plastic Frozen Test Tube Set (200pcs)