The Barlow lens' role is not just to improve the image quality;it's also play an important role of viewing comfortable. It's a great gift. More magnification for existing eyepieces to see the details of moon and bands of Jupiter clearly;the Barlow lens is a must Quality and value high power 5x Barlow lens to give a big magnification boost to any 1.25 inch eyepiece It will help double the capacity of an existing set eyepieces at the cost of a single eyepiece;It's super easy to use;you can simply insert eyepiece of choice into the Barlow lens;then insert it into the scope Barlow lens could also provide more magnification without reducing the exit hole on the eyepiece. Material:Aluminum alloy colour:black Package Contents: 1 * 5X 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.