This is the .Celestron 1.25'' 9mm X-Cel Eyepiece for Telescope [150746]

The newly enhanced X-Cel LX eyepiece series is what you have been waiting for in a high quality eyepiece for planetary viewing.With a brand new sleek, robust design and a twist-up eye guard, these eyepieces are especially designed for comfort and ease of use.They also have a wide 60&deg, field of view and 6-element fully multi-coated optics for magnificent wide field performance.X-Cel LX eyepieces are par focal and require little to no focusing when changing from low to high power.

Features:
Wide field of view enhances views of the night sky through a single lens
6-element fully multi-coated optics create sharper images
Extendable twist-up eyepieces are easier and more comfortable, especially for eyeglass wearers
No slip, rubber grip ring for secure handling, even in moist conditions
Par focal eyepiece require little to no focusing when changing from low to high power

Specifications:
Focal Length (mm) 9mm (0.35'')
Angular Field of View (deg): 60 &deg,
Eye Relief (mm): 16mm (0.63'')
Optical Coatings: Fully multi-coated
Barrel Size: 1.25'' (32mm) ...Contact us if you need more help.