Duck call reeds do not need to be replaced unless they start to split or develop blisters, Having extras on hand gives you the freedom to custom tune your duck call to your liking. Longer reed will be deeper sounding and require more air to operate, shorter reed will be higher pitched and take less air to operate. Play around with the reed lengths and see what fits your calling style.
O-rings should last quite a while long as they are kept well lubed, we use silicone grease. Grab ya some extra reeds and cork.
Includes 10 reeds, 5 corks and 2 o-rings.