ETF spotlight on iPath Dow Jones-UBS Grains ETN (NYSEArca: JJG), part of an ongoing series. The exchange traded note vaulted about 6% on Tuesday ahead of a crop report. [Corn ETF Jumps Before USDA Report]

Assets: $220.9 million.

Objective: The iPath Dow Jones-UBS Grains fund tries to reflect the returns of futures contracts on physical commodities.

Holdings: The fund holds three grains futures contracts.