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. UNBEATABLE WARRANTY & SUPPORT: Buy with confidence from Celestron, a leading telescope brand in California since 1960. Your purchase includes a 2-Year US Warranty and unlimited support from our team of US-based experts