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T-Rex Crab Island Hermit Crab Heat Mats are the most widely used habitat heaters in the world. They have been manufactured in Scotland for over 20 years and are all handmade to European standards. T-Rex Hermit Crab Heat Mats use UL-listed components and safe for use with plastic habitats. Has a 6 ft. long cord. Actual heat mat measures 4"" L x 3"" W.