Rolling Thunder CORE Two Stroke Double-Reed Cutdown Duck Call, Acrylic, Sage Green The Rolling Thunder CORE Two Stroke is a double-reed 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. Its double-reed configuration uses two reeds as the sound-producing arrangement. The cutdown designation identifies the call style, while the acrylic construction and color identify the physical configuration. Key Features Call design: Double-Reed Cutdown configuration. Acrylic construction: Acrylic call body. Color: Sage Green variant. Specifications Brand: Rolling Thunder Model: CORE Two Stroke Type: Double-Reed Cutdown duck call Material: Acrylic Color: Sage Green Shop the Rolling Thunder CORE Two Stroke Double-Reed Cutdown Duck Call, Acrylic, Sage Green at BattleHawk Armory.