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