I thought I'd post two responses to your original request for info about Mustang rope halters I happened across recently whilst researching the same subject:
Reviewed on Jeffersonspet.com
Nice Rope Halters
Reviewed By: Megan (NSB, FL)
I have 2 of these halters (One lime one pink) and love them!
They fit perfect. I like rope halters because my horses seem to lead better in them than regular halters. Plus these come with a leadrope for a great price! I will definitely be buying more. I usually keep all my tack, including halters, in the tackroom out of the sun/weather but have forgotten about them many times so they have faded a little but not bad. The color still looks good. :) 5 stars.....
Fade quick, but sturdy
Reviewed By: Arica (Fort Mitchell, AL)
I have 2 of these rope halters, and they have been put on a few horses with different sized heads, and fit well. My only complaint is how quickly they fade. We have the lime green, and hot pink, and both of them are very faded now. Other than that, you can't beat the price, because I have looked!