Duck Call Cork and Duck & Goose Reeds should be inspected and replaced when neccessary! We recommend changing duck call cork often to maintian the optimum tone of your call. Goose call reeds will blister and crack after a while creating unwanted buzzing and reed failure. Duck reeds do not usually need to be replaced unless they split, but buying extras gives you a chance to custom tune your duck call to your liking. Orings last a lifetime as long as they are kept well lubed with silicone grease, but some times fray from repeated tuning of a call. Grab all your tuning supplies here and hollar if you need help!