Here's What Trick Drums Say:
Designed for maximum impact, the Trick Dead Blow Beater applies precision technology to drum hardware.
The hollow head is made of solid milled aluminium and partially filled with a proprietary blend of material. Rigorous testing and development culminated in a material whose motion aids in impact as well as balance and rebound. While silently acting within the beater, the motion of the filler material drives the beater more firmly into the drum head.
Affixed to a beater shaft made of Fatigue Proof Steel, most commonly used to make axle shafts for race cars.