These bit guards provide all the protection of a traditional bit guard but with a soft gel moulding round the mouth piece offering protection for the corners of the mouth. Prevents pinching & rubbing and works with most type of bits. Also encourages bit to stay straight & balanced in horse's mouth, especially when turning. An invaluable aid for training young or difficult horses. The bit guards are quite flexible therefore this should allow them to fit relatively easy onto the vast majority of bits. If you are having problems we suggest that usually a short soak in warm water can help.