The SCS 4650 Blue Thermoplastic Wrist Strap with 5 ft. Coil Cord, 4mm Connection consists of an insulative exterior with conductive interior and metal male snap available in 4mm. Made of thermoplastic material, the 4650 is lightweight, low profile and makes contact with human skin, assuring employee compliance while helping to ensure ease of use. The “zipper” style latching mechanism easily adjusts to most wrist sizes. This single-wire wrist band includes a single-wire 5 ft. coiled cord.