Looking for broad exposure to the Mid Cap Value segment of the US equity market? You should consider the Invesco S&P MidCap 400 Revenue ETF (RWK), a passively managed exchange traded fund launched on 02/22/2008.The fund is sponsored by Invesco. It has amassed assets over $343.90 million, making it one of the average sized ETFs attempting to match the Mid Cap Value segment of the US equity market.Why Mid Cap ValueCompared to large and small cap companies, mid cap businesses tend to have higher growth prospects and are less volatile, respectively, with market capitalization between $2 billion and $10 billion. Thus, companies that fall under this category provide a stable and growth-heavy investment.Value stocks have lower than average price-to-earnings and price-to-book ratios. They also have lower than average sales and earnings growth rates. When you look at long-term performance, value stocks have outperformed growth stocks in nearly all markets. But in strong bull markets, growth stocks are more likely to be winners.CostsCost is an important factor in selecting the right ETF, and cheaper funds can significantly outperform their more expensive counterparts if all other fundamentals are the same.Annual operating expenses for this ETF are 0.39%, putting it on par with most peer products in the space.It has a 12-month trailing dividend yield of 1.23%.Sector Exposure and Top HoldingsIt is important to delve into an ETF's holdings before investing despite the many upsides to these kinds of funds like diversified exposure, which minimizes single stock risk. And, most ETFs are very transparent products that disclose their holdings on a daily basis.This ETF has heaviest allocation to the Consumer Discretionary sector--about 23.20% of the portfolio. Industrials and Information Technology round out the top three.Looking at individual holdings, Performance Food Group Co (PFGC) accounts for about 2.96% of total assets, followed by Td Synnex Corp (SNX) and Arrow Electronics Inc (ARW).The top 10 holdings account for about 16.18% of total assets under management.Performance and RiskRWK seeks to match the performance of the OFI Revenue Weighted Mid Cap Index before fees and expenses. The S&P MidCap 400 Revenue-Weighted Index is constructed using a rules-based methodology that re-weights the constituent securities of the S&P MidCap 400 Index according to the revenue earned by the companies in the parent index, subject to a maximum 5% per company weighting.The ETF has lost about -14.42% so far this year and is down about -11.63% in the last one year (as of 10/24/2022). In the past 52-week period, it has traded between $74.40 and $96.56.The ETF has a beta of 1.28 and standard deviation of 31.71% for the trailing three-year period, making it a medium risk choice in the space. With about 393 holdings, it effectively diversifies company-specific risk.AlternativesInvesco S&P MidCap 400 Revenue ETF carries a Zacks ETF Rank of 3 (Hold), which is based on expected asset class return, expense ratio, and momentum, among other factors. Thus, RWK is a good option for those seeking exposure to the Style Box - Mid Cap Value area of the market. Investors might also want to consider some other ETF options in the space.The iShares Russell MidCap Value ETF (IWS) and the Vanguard MidCap Value ETF (VOE) track a similar index. While iShares Russell MidCap Value ETF has $12.24 billion in assets, Vanguard MidCap Value ETF has $14.77 billion. IWS has an expense ratio of 0.23% and VOE charges 0.07%.Bottom-LineRetail and institutional investors increasingly turn to passively managed ETFs because they offer low costs, transparency, flexibility, and tax efficiency; these kind of funds are also excellent vehicles for long term investors.To learn more about this product and other ETFs, screen for products that match your investment objectives and read articles on latest developments in the ETF investing universe, please visit Zacks ETF Center. Want key ETF info delivered straight to your inbox? Zacks’ free Fund Newsletter will brief you on top news and analysis, as well as top-performing ETFs, each week.Get it free >>Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report Invesco S&P MidCap 400 Revenue ETF (RWK): ETF Research Reports Arrow Electronics, Inc. (ARW): Free Stock Analysis Report TD SYNNEX Corp. (SNX): Free Stock Analysis Report Performance Food Group Company (PFGC): Free Stock Analysis Report Vanguard MidCap Value ETF (VOE): ETF Research Reports iShares Russell MidCap Value ETF (IWS): ETF Research Reports To read this article on Zacks.com click here. Zacks Investment Research