Butterfly rings are more commonly used in driving but can also be used in riding. It offers a leverage action on the neck as well as on the chin via the curb chain. It contributes to a better control for powerful and/or hot horses. The shape of the limbs improves the direction of the horse thanks to its framing effect. It should be used with one or two pairs of reins with or without rings in order to fine-tune the adjustments and to best adapt to the rider's hand and the horse's mouth.