The PURIZE® x ALWAYS.READY air filters do NOT contain activated carbon and are supplied in a resealable 50 supply bag.Since both end caps are made of ceramic, there is no insertion or screwing-in direction to consider.PURIZE® x IMMER.READY air filters are made from environmentally conscious raw materials and are "Made in Germany".Dimensions: ø 5.9 mm x 26.9 mm