The flipper by which all others are measured by. Alexander manufactures this fully adjustable left hand aid - which takes the weight of the horn off of the pinky finger. This allows far more dexterity of the fingers. Note: This item needs to be soldered on to the horn by a qualified technician. One Caveat: Only tighten the screws far enough that the flipper does not slip up or down. If over tightened you can break the top part of the clamp.