Celestron 93529 X-Cel LX 1.25-Inch 2x Barlow Lens (Black) Quality X-Cel Lx 2X Barlow Doubles The Magnification Of Any 1.25" Eyepiece. 3-Element Apochromatic, Fully Multi-Coated Optics Offer Up Bright, Sharp Images. A rubber grip helps to avoid accidental drops Barrel is threaded to accept standard 1.25" filters. A brass compression ring holds the eyepiece firmly in place.