Nylon's particular properties have encouranged manufacturers to use it in the production of spinning and twisting travellers.
The exceptional results, particularly when nylon travellers are used on sintered metal rings, have increased their application in a short time in mills all over the world so much so that they are standard equipment.
The use of nylon travellers when yarn type and count permit, is always preferable to metal travellers for the following reasons:

1) Yarn tension is more uniform
2) Yarn quality is improved
3) Reduced ring wear
4) Less ring lubrication is required and leads to more costant and efficent performance
5) Increase in traveller speed
6) Considerable operating noise reduction
7) Easier to put on
8) Improved safety

Nylon travellers are subdivided into 2 groups. European Series and American Series.

European Series
The traveller is identified by
- ring depth (in mm or inches)
- traveller weight (in mg per traveller)
- traveller shape
e.g. 16,67 mm 21/32" 500 C.

American Series
The code shows a number inserted between two letters or groups of letters
e.g. G 40 C.
The first letter, in our example G, indicates ring depth (43/64" 17.1 mm), the number (40) the weight of travellers expressed in grains per 10 travellers, the last letter C indicates the style.
In order to obtain the weight in milligrams per traveller multiply the grain size by 6.48 (in our example 40 x 6.48 = mt. 259.20)
Whether for the European or American series the suffixes M,/3,/4 indicate that the traveller is reinforced with glass fibre.