Bahtinov Focus Mask, Focusing Mask Acrylic Telescope Focusing Mask, 100 To 140Mm Caliber Fixed Diameter, Telescope Focus Mask Fo Pilot Headsets * Durable design

* Durable design

Anodic Oxidation Treatment

and iPods to Bluetooth receivers

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Bahtinov Focus Mask, Focusing Mask Acrylic Telescope Focusing Mask, 100 To 140Mm Caliber Fixed Diameter, Telescope Focus Mask Fo Pilot Headsets * Durable designSpecification: Item Type:&Nbsp; Telescope&Nbsp; Focus&Nbsp; Mask Material: Acrylic Thickness: Approx. 2Mm 0. 08In Color: As Pictures Shown Weight: Approx. 38G 1. 3Oz The Outer Diameter Size Range Of The Telescope Objective Lens Is Supported: Approx. 100 140Mm 3. 9 5. 5In (There Is An Error Of 1 2Mm In Manual Measurement) Package List: 1 X Bahtinov Mask 3 X Mounting Accessories