The WoodHaven Ninja Stone is a durable conditioning tool built from a blend of polymer and stone, designed specifically for maintaining crystal and glass friction calls. Its ergonomic handle gives you a secure, comfortable grip, making it easy to refresh your calling surface and keep it performing at peak realism. Whether you're tuning up before a hunt or touching up in the field, the Ninja Stone delivers consistent, reliable conditioning that helps your call produce sharp, clean, turkeytrue sound.