NEW YORK ( TheStreet) --The other day a client asked about whether investing in preferred stocks could be a good way to generate some yield while still having protection against rising interest rates. There are several preferred stock exchange-traded funds to study that might address the question.PFF) with $9.8 billion in assets and the PowerShares Preferred Portfolio ( PGX) with $2.2 billion. The funds are similar. They each have over 80% in various industries within the financial sector. The funds also have considerable overlap in preferred stock issuers in their holdings. Issues from big banks like Wells Fargo ( WFC), Citigroup ( C) and HSBC Holdings ( HBC) are common to most of the preferred stock ETFs, along with General Motors ( GM). PFF and PGX also have a similar distribution of maturity dates for their holdings. PFF has a combined 87% of its assets in issues that mature in 25 years or longer and perpetual preferreds that don't have a maturity date. PGX has 94% in holdings that mature in 25 years or more. Because of things like call dates, the effective duration for the funds is 4.54 years and 6.66 years respectively. Both funds also have similar yields near 6%. The seemingly short durations of the funds didn't prevent them from declining noticeably since Federal Reserve Chairman Ben Bernanke sent shockwaves through the markets with talk of reducing bond purchases. PFF bottomed out with a 9.5% decline, compared with a 10.6% drop for PGX. The declines suggest that preferred stocks, and the funds that offer exposure to the space, are sensitive to interest rates. Most of the other funds in the segment have had similar declines over the last couple of months with one notable exception. The Global X Super Income Preferred ETF ( SPFF) has declined only 4.2% since the Bernanke comments as the other funds have declined more than twice as much.