Made by hand in South San Francisco, USA. (Used with Die-Cast hoops) The Pro-Lock is used to secure the Snareweight #3,4,5 or JR Snareweight to die-cast hoops. Pro-lock incorporates an arched magnet to attract to the magnet of the Snareweight #4 through the die-cast hoop. It has a slot that Snareweight drops into, then creates a floating lock to secure damper. “Snareweight #5” with a “Pro Lock” is as good as it gets for dampening and road worthy durability. Because of the lock between the two magnets, with even the hardest drum hit it will reset itself and fall back into place with perfect contact/balance to the head- making it impossible to unhinge itself from the hoop unlike other hardware methods that eventually come undone. Lastly after more engineering and many more hours of testing - we have incorporated a couple of side isolation sorbothane dampers for less jitter when used on toms. *note* pro lock is not designed for snareweight models #1 (2012) or model #2 (2013)