Features:

High resolution color corrects   
The lens edges are blackened to maximize image contrast
Essentially triple the power of any 1.25" telescope eyepiece with the Universal Barlow Lens
Sophisticated fully multi-coated, eliminate unwanted reflections, increase contrast
The body is full black metal constructed and precision CNC-machined

 
Specification:

Barrel Size: 1.25 inch    
Magnification Factor: 3x    
Achromatic Coatings: Fully multi-coated

Package include:

1 X Barlow Lens
2 X Free dust caps