The smallest of the Purize filters, the Xtra Slim Size active charcoal filter, comes in a handy resealable storage bag. It's also ideal for travel, as the filters can be kept air and water-tight. The Purize Xtra Slim Size active charcoal filters significantly reduce the amounts of pollutants absorbed and provide you with a fresh, dry, and aromatic smoking experience. The filters are suitable for all rolling methods! Both caps being ceramic, there is no direction for insertion or rolling to observe. All PURIZE® filters are made from eco-friendly raw materials and are "Made in Germany". Dimensions of the Purize Xtra Slim Size active charcoal filter: ø 5.9 mm x 26.9 mm