Overview: This is a great little wristband for you Fitbit one tracker. The material is enough flexible, which allow you pop the Fitbit one in/ out the band with ease. Once the tracker is in place, it fits tight enough that it is not falling apart or falling out of the band. The end of the band has a metal clasp with two prongs, using it you can slide into the suitable notches where fits perfectly. If you don??t like the original clip case on Fitbit tracker or look for a secure way to carry the Fitbit on, you may consider this is a good replacement and back-up! Specifications: Material: Silicone + metal Fit wrist within size 165mm - 230mm/ 6.5 inch - 9.06 inches (one size) Skin-friendly, no irritation on human skin Package & Delivery: a. one unit include accessory bands only, not include fitbit tracker or other parts (see attached image) b. Normally items packed in standard kraft bubble packet, which is water-resistant, shake-proof and anti-tamper, can keep items arrive in good condition. (applied for order shipped from China) c. Provide USPS tracking number per order, most of American district needs 7 C 10 days for delivery , some remote districts may need 7- 15 days. (applied for order shipped from China) & Disclaimer: 30 days mone passometery back gurantee and 30 days for all products from B-Great. Please notice the SELLER NAME when you click the button h i Add to Cart? , our name is h i B-Great? and we take full ownership and responsibility for the products under this brand. If you select another seller from our created listings, we can??t guarantee the quality!! Please support B-Great, thanks for your understanding!! "