1. Material:silicone and manganese steel inside 2. Good quality and low price 3. OEM & ODM ... services are available MaterialSilicone and Manganese Steel insideColorsWhite,Red,Blue,Green,Purple,Yellow,etcMaterial100% siliconeWeight19.8g /36g ... Approval,and got SGS,RoHS,FDA,LFGB certificates Made in Shenzhen silicon wristband