The o-rings are hard wearing. How long exactly will depend how the wallet is treated. Twelve o-rings will be included with each wallet; enough for 3 full sets. I will ensure that as long as the Omega wallet is in production, I will supply replacements. Also keep in mind, the o-rings used with the Omega wallet will be available from any o-ring supplier, anywhere in the world. Obtaining replacements will never be an issue.