Tkasing Bands for Fitbit Alta/Alta HR Bands Replacement Accessory Wristband with Metal Clasp for Fitness Activity Tracker (No Tracker) Size: Large(6.7-8.1"),Small(5.5-6.7") There are 4 different colors for choosing,Personalize your wristband to match your daily style with this brand new color choices No Tracker or other parts! For Fitbit Alta Band only! Not for Fitbit Flex or other Models Material: Silicone