With an expense ratio of 0.55 percent and an effective duration of 4.83 years, ELD has gained prominence as investors have looked for ways to get exposure to strong government balance sheets in the emerging world . Flying under the radar is the FlexShares iBoxx 3-Year Target Duration TIPS Index Fund (NYSE: TDTT ), which charges just 0.2 percent per year. TDTT "gives investors access to the inflation-hedging qualities of TIPS and seeks to provide targeted duration exposure through changing interest rate and economic cycles," according to FlexShares .