QBL1077 Features: * Diffuser * Manufactured from an all-natural lime wood * Precisely hand-cut against the grain of the wood * Hand-cut allows for maximum output of super-fine bubbles to be released from the micro pores of the wood * Ideal for use in air-driven, saltwater protein skimmers * 2 Pack Dimensions: * Dimensions: 6"" H x 3"" W x 3"" D