Crittertrail Playpen With MatCritterTrail Playpen Features Twelve Fun & Colorful Wire Panels! Each Panel Measures 5.5"L x 9"H with .75" Wire Spacing Protective Mat Measures 24" x 28", to Guard Against Messes Ideal Exercise Fun for Hamsters or Gerbils Includes Optional Passageway Connector for Attaching to any Critter..