Vic Firth 5B Kinetic Force Drum Sticks Length: 16" Weighted butt end Because of the more dense material added to the butt end of these American Classic sticks they can be played longer and harder with less fatigue They can also help you play faster! Kinetic energy is a function of mass and speed Because of the more dense material added to the butt end of these American Classic sticks they can be played longer and harder with less fatigue