Upon redemption of a oneToken, you may claim $1 of collateral reserves while supplies last. oneTokens can accept multiple stablecoins for Collateral. Therefore, the amount of each stablecoin is an upper limit of how much can be redeemed of that specific stablecoin. E.g. If the contract accepts USDC or USDT as Collateral then the user may be forced to accept multiple stablecoins when redeeming if their oneToken holdings are larger than the Collateral of a single stablecoin.