Rolling Thunder CORE Brute XLS Cutdown Duck Call, Acrylic, Sage Green The Rolling Thunder CORE Brute XLS is a cutdown duck call made in acrylic with a Sage Green color treatment. The named call design and material are the key distinctions of this version. The cutdown designation describes the call format. This is a dedicated duck call for waterfowl calling, with the CORE Brute XLS name distinguishing its specific design. The Sage Green treatment provides the visual identity of this acrylic version. Key Features Call design: Cutdown configuration. Acrylic construction: Acrylic call body. Color: Sage Green variant. Specifications Brand: Rolling Thunder Model: CORE Brute XLS Type: Cutdown duck call Material: Acrylic Color: Sage Green Shop the Rolling Thunder CORE Brute XLS Cutdown Duck Call, Acrylic, Sage Green at BattleHawk Armory.