Coles Oil Sunflower is the absolute highest-grade black oil sunflower out there. It is over 99% pure and cleaned four times to ensure that you get more seed and fewer sticks. Plus it is positively chock full of oil. You want as much oil in your sunflower as you can get because that is what attracts the birds. So, our high-grade, high-oil sunflower means more birds at your bird feeder. The soft, thin shell and high oil content make this the birds' favorite type of sunflower. Great for year round feeding.