The growth stocks provide access to the faster growing and more expensive half of the U.S. small-cap market. The value stocks, on the other hand, provide exposure to cheaper and potentially higher-returning half of the small-caps market

Alternatively, investors can look into the even smaller, micro-cap segment of the market through the iShares Micro-Cap ETF (NYSEArca: IWC), PowerShares Zacks Micro Cap Portfolio (NYSEArca: PZI) and Guggenheim Wilshire Micro-Cap ETF (NYSEArca: WMCR). However, due to the illiquid nature of the micro-cap market, these ETFs have exhibited greater volatility and trade less frequently than their large-cap counterparts. IWC has a 0.60% expense ratio, PZI has a 0.91% expense ratio and WMCR has a 0.53% expense ratio.

For foreign exposure, international small-cap ETFs allow investors to diversify away from a U.S.-centric portfolio. Investors can browse through options like the WisdomTree International SmallCap Dividend Fund (NYSEArca: DLS), SPDR S&P International Small Cap ETF (NYSEArca: GWX) and Schwab International Small-Cap Equity ETF (NYSEArca: SCHC). Moreover, there are a number of country-specific ETFs that target the small-cap category as well. DLS has a 0.58% expense ratio, GWX has a 0.59% expense ratio and SCHC has a 0.19% expense ratio. [ETFs To Tap Into India’s Rising Consumer Confidence]

For more information on small-capitalization stocks, visit our small-cap category.

Max Chen contributed to this article.