Feature:1. The interlayer contains a small amount of activated carbon, effectively helping clean the harmful substance.2. Double‑sided design filtration, super adsorption, better performance and high reliability.3. This filter cartridges can be repeatedly added to the filter box to enhance the filtering effect.4. Manufactured with excellent PVC plastic, strictly follow factory quality control.5. A good filter accessory replacement, easy and simple to use, effectively improves water quality.Specification:Condition: 100% brand newItem Type: Filter cartridgesMaterial: PVC plasticColor: BlueUses: Filter replaces carbon plate, improves water quality, helps clean the harmful substanceProduct Size: Length of Down Bottom:Approx. 7.5cm / 3inLength of Upper Bottom: Approx. 8.1cm / 3.2inHeight: Approx.14.8cm / 5.8in.Package List:4 x Blue Filter Cartridges