This is the Gator GPA-SCVR450-515. A part of their Speaker Cover Range. It is a Speaker Cover; Works While Speaker Is On Stand; Fits Mackie SRM 300/450, JBL 515, & Many More. Speaker Cover with Hideaway Rain Cover with Designed to fit while on speaker stand. Features include - Zippered Access to Speaker Front so Speaker Can Function in Cover, Access to handles with Velcro cover, Access to rear control panel to allow cables to remain plugged in, and Patent pending.