JKing Plastic Wrist Key Coil Wrist Band Key Ring Key Chains Key Holder for Outdoor Sport,Set of 6 (Black) Material: Plastic Bright colors,durable,convenient to use,can be hold your keys easily Flexible plastic coil expands to secure keys around wrist,and fits comfortably perfectly around your wrist Coil size:about 50mm,with 1"(25mm) diameter nickel plated steel split ring They are suitable for securing keys ,perfect for company,home,outdoor sport ,or during water sports etc