Woodhaven Turkey Call Friction The Ninja Model: WH087 The Ninja Crystal� is built into a walnut pot with a YellowHeart soundboard which offers a very true to life turkey sound. � This call comes with two hand-matched strikers, one being our new YellowHeart/walnut �Ninja Stick� and the other being hickory that that will offer each hunter the ability to sound like two different hens. The Ninja Crystal� produces great two-tone yelps as well as great cutts, cackles, and purrs. � This call affords you the ability to call both loud and soft. The all new Ninja Crystal� is a killer call that is soon to be a favorite among turkey hunters nationwide!