Incuriosito, ho voluto approfondire ed ho trovato questo sito dove c'è la storia:
The Radial Bridge design was created by inventor Steven Volpp and, until 2002, was manufactured and distributed through Peavey Electronics. The Radial Bridge drums are currently out of production and, with the exception of a few lingering kits here or there, unavailable.
What makes the premier lines of Peavey drums unique is the patented Radial Bridge System. The idea behind the Radial Bridge System is to create head tension without weighing down the shell with lugs and bolts that interfere with its resonance. The head tension is taken by heavy wooden hoops that support the heads with no mounting hardware attached to the shells. This allows the shells to perpetuate a louder and longer sustaining sound.
Peavey tom-toms were made with thin 1/10 of an inch thick, three-ply shells, and the bass drums with five ply shells. Conversely, Peavey's snare drums are made with heavy 1 3/4 inch thick shells that bring out the high overtones in the snare sound.
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