The PLÖSSL Telescope Eyepiece 3 Set includes three coated lenses with focal lengths of 6mm, 12.5mm, and 20mm, designed for use with telescopes. These eyepieces have a 1.25 inch diameter and are perfect for viewing a variety of celestial objects with precision and clarity. Made in the USA, these eyepieces offer high-quality optics for enhanced viewing experiences for telescope enthusiasts.