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If a customer is tying baitfish-type fly patterns and wants the greatest sink rate for each given barbell size, plus the enhanced look of pupils, we recommend Hareline flat-end tungsten hour glass barbell fly tying eyes. Hour glass barbell eyes are different from standard barbells in that the center stem is slimmer and is slightly off-center. As the photo shows, this makes it a little easier to center the barbell on the hook shank and makes securing these barbell eyes a simple task.