1. The SV213 1.25inch 3xBarlow lens is an air-spaced, fully multi-coated 3-element apochromatic design. 2. The housing is precision machined from aluminum stock and black anodized to achieve a hard . 3. The Barlow lens has a compression ring that will not leave any marks on the camera or eyepiece. 4. The edge of the lens is black-treated to internal light scattering, thereby maximizing image contrast. 5. Fits any 1.25inch or diagonal, recommended for planetary and lunar imaging and visual observation. Colour:Black Material:Aluminum Alloy Package Contents: 1 x barlow lens Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.