JKing New 10Pcs Coil Wrist Bands Keychains Plastic Spring Key Coil Wrist Band Key Ring Chains Key Holders for Outdoor Sport (Pink) Wrist coil size:about 50mm; With 1"(25mm) diameter nickel plated steel split ring Assorted 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 Material: Plastic Perfect for securing keys,for outdoor sport,or during water sports,home,office,sauna etc