RTOM BLKHOL08 Moongel Black Hole 8" Snap-On Mesh Practice PadSnap it on, tune to your desired tension, and youre ready to go. The Black Hole Practice System was designed to resolve the long time struggle that drummers have faced: practicing or playing their drums without driving everyone around them crazy. Mesh and Sound Patch The Black Hole features a heavy duty mesh head coupled with a specially designed sound patch to give players the most realistic feel possible. The thicker and stiffer mesh allows for the