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In an effort to provide the best possible service to our customers, Thorlabs has made a commitment to ship OFR's most popular free-space and fiber isolator models from stock. We currently offer same-day shipping on more than 90 isolator models. In addition to these stock models, non-stock isolators with differing aperture sizes, wavelength ranges, package sizes, and polarizers are available. These generally have the same price as a similar stock unit. If you would like a quote on a non-stock isolator, please fill out the form on our custom isolator's page.