HuanX35 Colorful Spring Spiral Wrist Coil Flexible Spiral Coil Wristband,Wrist Band Key Ring Chain Key Tag for Gym, Pool, ID Badege (5pcs) MATERIAL-EVA(Ethyleno Vinyl Acetale Copolymetr) spring ring and metal keychain. PARAMETERS-Inner dia of spring ring is 3.5cm and the outer is 5.5cm.The dia of wire is 2.5mm.The dia of keyring is 2.5cm. COLORS-5 colors(red,yellow,green,blue,white),1pc for each color. FEATURES-Colorful,lightweight,flexible,comfortable,convenient. APPLICATIONS-Use to hold keys,ID label,memory card,number tag,etc for outdoor activities,gym,swimming,surfing,sauna and so on.