IN 18×19 integration hair topper — clearance pricing. A large-base integration topper that allows your own hair to be pulled through for a blended look. Base: Integration base (open mesh) Base size: 18cm × 19cm Hair: 100% human hair Status: Clearance — limited stock Integration toppers feature an open mesh base that allows your own hair to blend with the added hair, creating a natural, voluminous result.