Base material: PE foam, 1 mm thick Glue: hypoallergenic, medical Sensor: ABS plastic with silver chloride layer Support: Stainless Steel Connection: Stainless steel push button Gel: conductive gel with 3% potassium chloride Electrical characteristics: according to the AAMI EC-12 standard Dimensions: 32 x 32 mm. Packaging: bags of 50 pieces