A torsional vibration damper includes a primary mass defining a ring-shaped chamber, a secondary mass relatively rotatably connected to the primary mass, and a damping unit for coupling the primary and secondary masses to each other in a rotationally elastic manner. The first magnetic part and the second magnetic part are coupled by a magnetic force. The organo-metallic layer may prevent solder from wetting on the sidewalls of the pillar during subsequent bondingreflow processes. The compositions are useful for preparing ion exchange membranes. Accordingly, the device improves consistency and stability when aiming and firing a handgun without compromising the speed at which the user may receive and release the handgun and without encumbering the movement of the user’s arm.