DIAL tracks an index that provides exposure to six different sectors within the fixed income space. The index assigns each of the six sectors a fixed target weight: 30% to US high-yield corporate bonds, 20% to emerging-markets sovereign debt, 15% to US investment-grade corporate bonds, 15% to US mortgage-backed securities, 10% to US Treasuries, and 10% to global sovereign bonds ex-US. While the sector allocations are kept static, the underlying securities in each sector change during each annual reconstitution. All sector sub-indexes are selected and weighted by market value, except for the global sovereign bonds sector, which is equally weighted. Considering that half of the portfolio is reserved for US high-yield bonds and emerging-market sovereign debt, DIAL isnt the best representation of the global fixed income space. However, it boasts one of the lowest expense ratios in the segment.