Affects yarn quality and life of (RT). Sections are:
a- Flat (F): for average Spindle speed and Cotton ,Rayon Yarn.
b- Half round (HR) for blended Yarn such as Cotton / Polyester.
c- Half round wide (HD) for fine and medium Yarn Count ,Cotton, stable Yarn ,blended Yarn,improved Hairiness +life time of (RT)
d- Round (R) for some Synthetic Yarn ,long stable Fiber ,Wool with lower Spindle Speed.
e- There are some other wire sections for special Yarn process such as round flat [RF] for Acrylic Yarn.