Hippie Halters uses synthetic rope for its halters, because synthetic rope is stronger and more durable. We use rope that is 1/4 of an inch in diameter, which is the standard for rope halters. If you would like your rope halter tied with a specific type of rope, or would like the diameter of the rope thicker (5/16 inch or 7/16 inch), we can special order the rope for you and then hand tie the halter according to the measurements of your horse. This is considered a special custom order, and is priced individually. Please email us at info@lightfoothorsefarm.com for more information.