... . OEM & ODM services are available MaterialSilicone and Manganese Steel insideColorsWhite,Red,Blue,Green,Purple,Yellow,etcMaterial100% siliconeWeight19.8g /36g/37.4g ... ISO9001:2000 Approval,and got SGS,RoHS,FDA,LFGB certificates 2010 top fashion silicone watch strap