The denicotea silica gel filter uses purest silicon oxide and thus guarantees a neutral-tasting filter effect. Due to its highly porous structure, silica gel has the property of absorbing nicotine and condensate to a high degree. The transparent denicotea standard filter indicates by its discoloration when it is saturated and should be replaced. Suitable for cigarette holders and pipes. Only genuine with the red cap! 50 pcs