Box of 20 Fiber Optic Connectors: Black ceramic ferrule for increased efficiency and reduced autofluorescence.-2.50mm ferrule diameter-400 um fiber core diameter-NA=0.37-Length = 10mm-Available in boxes of 20 Optimize your fiber photometry system with our Fiber Optic Cannulae (FOC) designed to ensure optimal performance in your experiments. Ferrule diameter: 1.25mm or 2.5mmFiber core diameter: 200um or 400umLength: 10mmNA: 0.37 FOC are sold in packs of 20. To connect to a patch cord, you will need an adapter. We sell white ceramic split sleeves for this purpose, which are available for $1/each. Pricing: FOCs: $20 each Bulk discounts: $18 each for orders of 100 or more FOC $17 each for orders of 200 or more FOC $15 each for orders of 500 or more FOC For custom orders, please contact: [email protected] Note: The lead time for custom fibers is 4 weeks.