Zink Calls Thunder Ridge Series Slate - At 150 yards or 15 feet, the Thunder Ridge Series will guarantee consistency in every call and note. It is crafted with state of the art injection molding that will bring in Long Beards closer than ever. Turkey Time University Vol. II Friction Calling Basics is included with every Thunder Ridge Series Call. Injection Molded PotSlate SurfaceTwo Piece Hardwood StrikerConditioning PadBuilt in Striker Conditioning PocketCopy of Zinks Turkey Time University Vol. II Friction Calling Basics