YINUO&reg; One Piece Soft Replacement Bands for Fitbit FLEX Only / Fitbit Flex Band / Fitbit Flex Wristband / Fitbit Bracelet with Anti-falloff Buckle (Purple) Soft material; feel comfortable to wear in your hand Adjustable width from 150mm to 195mm fits most wrists size A secure watchband-style closure to prevent from losing your Fitbit device A top window cutout shows Fitbit device LED light; hollowed-out bottom avoid moisture Only for Fitbit Flex Wristband replacement! Not for Fitbit One or Force or other models