NcStar Tactical Red/Green/Bue Dot w/ Cantilever Weaver Mount. the 30mm cantilever Weaver style mount allows you to mount onto most weaver style or picatinny rails. The Nc Star Multicolor Dot Sight has red green and Blue LEDs which are 100percent safe for the eyes. To top it off there are three brightness settings for the red green and blue dots. The NcStar Tactical Red Dot Sight is just what you need to mount on your gun. Specifications for NcStar Tactical Red/Green/Blue Dot Sight w/ Cantilever Weaver Mount: Manufacturer: NcSTAR Color: Black Finish: Anodized Fabric/Material: Aluminum Magnification: 1 x Objective Lens Diameter: 35 mm Reticle: 3 MOA Dot Illumination Color: Green Blue Red Eye Relief: Unlimited Adjustment Click Value: 1 MOA Emitter Type: Enclosed Optical Coating: Platinum Battery Type: CR2032 Length: 5 in Width: 2.7 in Height: 3.1 in Weight: 8.9 oz Magnification Type: Fixed Quantity: 1 Red Dot Sights-Footprint: Not Applicable Mount Type: Weaver Gun Rail: Weaver Features of NcStar Tactical Multi-Color Dot Sight w/ Cantilever Weaver Mount: Unlimited eye relief Black anodized aluminum construction Three brightness settings for the Red Green Blue Dots 30mm Cantilever Weaver Style Mount for mounting onto most Weaver Style/Picatinny rails Red Green and Blue LEDs (Light Emitting Diode) 100percent safe for the eyes Package Contents: NcStar Tactical Red/Green/Blue Dot Sight w/ Cantilever Weaver Mount NcStar Tactical Red/Green/Bue Dot w/ Cantilever Weaver Mount