In order to reduce the pollutants when smoking, activated charcoal has been used in these filter sleeves from Dark Horse. The king-size tubes can be filled with any standard tamping device. All in white they also create a classic look. At a glance: - Diameter: approx. 6.1 mm- Sleeve length: approx. 84 mm- Filter length: approx. 15 mm- 120 tubes per box