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Aquarium Ceramic Rings in a 10" X 12" Bag / Approximately 2kg Red Sea Four stage hosetails for flexibleAquarium ceramoc rings effective filter media Bag size is approximately 10" x 12" but is a storage bag only, not to be placed in the aquarium due to metal fastener Approximately 2kg Ceramic Ring Dimensions 1. 2cm x 1cm Suitable for aquariums with sumps, external filters etc.