300 series stainless steel back plate is 0.016 Inch thick. Provides 1.4 sq-inch of skin contact surface. ABS plastic cap, blue, with teeth to hold knitted material during bonding. 4 mm snap stud machined from 300 series stainless steel, Fits to 4 mm spring loaded medical type socket. Knit elastic band material of light blue fiber 1.125 Inch wide and 0.1 Inch thick, 65 strands of textured polyester, 46 strands of lycra spandex and 14 strands of silver plated polypropylene yarn. - The Desco reusable wrist strap includes banana plug, alligator clip. The conductive silver plated polypropylene represents 14.5% of the material by weight. The 14 strands of conductive polypropylene are uniformly knit on the inner surface of the material and are electrically isolated from the outer surface (blue side). Without coil cord. ESD Control. Reusable.