Nylon curb chain from Bomber.

This product is a simple aid that can make a big difference. The nylon strap can be used with most multi-ring bits (2.5/Universal, 3 Rings, etc.) and pelham. It prevents the bit from rotating and keeps it well in place. Perfect for horses that are somewhat sensitive in the mouth and easily feel discomfort from a moving bit.

When the strap is tightened, the leverage effect increases and the reaction in the horse's mouth becomes quicker (and therefore sharper). A nylon strap provides a milder effect than a metal curb chain.