The parameters of rod lenses can vary depending on the specific product. The following are some common parameters: 

Dimensions: Including length and diameter. For example, there are rod lenses with a length of 29mm and a diameter of 2.77mm, as well as those with a diameter of 5mm and a length of 17.5mm.

Material: Such as optical glass material H-K9L, and rod lenses made of K9 material.

Surface quality: For instance, some rod lenses have a surface quality of 60-40 (scratch-dig specification, which indicates the maximum number of scratches and pits per square inch).

Coating: Some rod lenses are uncoated, while others can be coated according to specific needs.

End face shape: There are rod lenses with hemispherical end faces.