These are pre-cleaned microscope round coverslips with 18mm diameter in factory-sealed box. They are manufactured under the strict guidelines established by ISO 9001: 2000 Standards. 

Key Features:

• 1 order =  5 boxes of Round Coverslips with 100 per box. (500 total)
• Dimension: 3/4" (18mm) in diameter
• Thickness: 0.006" (0.13 - 0.17 mm)
• Non-fogging, non-sticking and no bubbles, scratches or striations
• Pre-cleaned and blank
• Clear optical glass
• Superb flatness uniform distortion-free surface
• Manufactured Under ISO 9001 Quality Control Standard