13" Marching Staccato Disk™. The Marching Staccato Disk is a flat circle of Retro Screen™ mesh designed to suppress unwanted overtones. Particularly well-suited to indoor marching venues where maximum note definition is required. The Evans™ X-Treme™ Patch for marching is the ticket to drawing several sounds - what we call "zones of expression" - out of a single drum head.