Unlike the current product, this type is used by inserting it between the pages of a double book. It's convenient because you can make fine adjustments to the positioning. This product is from about 20 years ago? The packaging has yellowed from UV exposure, but it's new. For weight tuning of frog lures for snakehead and bass! 2.8g 4.0g One pack of each, for a total of two packs.