Tough1 Harness Leather Headstall with Training Bosal & Cord Split Reins. This training bosal was designed to to fit snuggly on the horses nose and cup the jaw for quick engagement and release. Great for teaching, collection, bending, and stopping. The rawhide nose applies pressure to help when bending and turning, while t... - Tough1 Harness Leather Headstall with Training Bosal & Cord Split Reins.