XTA1066 Features: * Replacement filter cartridges * Ready to use * Replaces whisper * 3 per pack Includes: * Timestrip cartridge change indicators included Options: * Available in large and medium sizes Dimensions: * Medium Dimensions: 2.8"" H x 5.75"" W x 3.75"" D * Large Dimensions: 2.75"" H x 7"" W x 4.75"" D