The Mallardtone Custom Grunt call is made from the Highest Grade Walnut.  The solid 2 piece design gives you the versatility to easily adjust the O-ring inside, by sliding it up or down on the reed, to CUSTOM TUNE the call and give you the deep low dominant buck grunts, to younger buck grunts, doe bleats and fawn calls.  There is a small hole on the side of the barrel that you can open up or close off with your finger to let you change up the pitch of the calls also.  This is the last deer call you will ever need!