This model was developed with Maestro Floyd to accommodate his behind the collar grip with the balance point under the index finger. The "flat-spot" is for the thumb to rest. The flat-spot also allows for the baton to become an extension of the thumb. There is a slight concave for the middle and ring fingers to rest as well. Daniel's grip is modeled after that of the great Sir Adrian Boult and the amazing Carols Kleiber. - the manufacturer